MC	<p>05d1_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.5</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>05d1_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.5</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>0853_1b62</p> <p><strong>Succinic acid</strong> and its conjugate base, succinate, is an intermediate in the citric acid cycle and can act as a signaling molecule reflecting the cellular metabolic state.</p> <p>Succinic acid is diprotic with pK<sub>a</sub> values of <strong>4.20</strong> and <strong>5.60</strong>.</p> <p>Succinic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #8B0000">(CH<sub>2</sub>)<sub>2</sub>(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(CH<sub>2</sub>)<sub>2</sub>(COOH)(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(CH<sub>2</sub>)<sub>2</sub>(COOH)<sub>2</sub></span>	Correct
MC	<p>0853_fc76</p> <p><strong>Succinic acid</strong> and its conjugate base, succinate, is an intermediate in the citric acid cycle and can act as a signaling molecule reflecting the cellular metabolic state.</p> <p>Succinic acid is diprotic with pK<sub>a</sub> values of <strong>4.20</strong> and <strong>5.60</strong>.</p> <p>Succinic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #00008B">(CH<sub>2</sub>)<sub>2</sub>(COOH)<sub>2</sub></span>	Correct	B. <span style="color: #404040">(CH<sub>2</sub>)<sub>2</sub>(COOH)(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(CH<sub>2</sub>)<sub>2</sub>(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect
MC	<p>0a05_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.0</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect
MC	<p>0a05_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>0a93_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 1.0</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Correct
MC	<p>0a93_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 1.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Correct	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>0bcd_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.0</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect
MC	<p>0bcd_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>16a9_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>16a9_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.5</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect
MC	<p>1761_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Correct	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>1761_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.5</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Correct
MC	<p>1bd2_1b50</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Correct	C. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect
MC	<p>1bd2_ea1c</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Correct	C. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect
MC	<p>2033_1b62</p> <p><strong>Succinic acid</strong> and its conjugate base, succinate, is an intermediate in the citric acid cycle and can act as a signaling molecule reflecting the cellular metabolic state.</p> <p>Succinic acid is diprotic with pK<sub>a</sub> values of <strong>4.20</strong> and <strong>5.60</strong>.</p> <p>Succinic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #8B0000">(CH<sub>2</sub>)<sub>2</sub>(COO)<sub>2</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">(CH<sub>2</sub>)<sub>2</sub>(COOH)(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(CH<sub>2</sub>)<sub>2</sub>(COOH)<sub>2</sub></span>	Incorrect
MC	<p>2033_fc76</p> <p><strong>Succinic acid</strong> and its conjugate base, succinate, is an intermediate in the citric acid cycle and can act as a signaling molecule reflecting the cellular metabolic state.</p> <p>Succinic acid is diprotic with pK<sub>a</sub> values of <strong>4.20</strong> and <strong>5.60</strong>.</p> <p>Succinic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #00008B">(CH<sub>2</sub>)<sub>2</sub>(COOH)<sub>2</sub></span>	Incorrect	B. <span style="color: #404040">(CH<sub>2</sub>)<sub>2</sub>(COOH)(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(CH<sub>2</sub>)<sub>2</sub>(COO)<sub>2</sub><sup>2-</sup></span>	Correct
MC	<p>2217_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect
MC	<p>2217_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>2281_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.5</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect
MC	<p>2281_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>22f3_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.5</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect
MC	<p>22f3_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>233b_809f</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.5</strong>?</p>	A. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect
MC	<p>233b_e41c</p> <p><strong>Sulfurous acid</strong> and its conjugate base, sulfite, occurs naturally in wine, but larger amounts are added to wine to stop fermentation and prevent spoilage.</p> <p>Sulfurous acid is diprotic with pK<sub>a</sub> values of <strong>1.81</strong> and <strong>6.97</strong>.</p> <p>Sulfurous acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>SO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HSO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">SO<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>2d27_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>2d27_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>2d55_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 12.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>2d55_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 12.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>3324_1b50</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.0</strong>?</p>	A. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Correct	C. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect
MC	<p>3324_ea1c</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.0</strong>?</p>	A. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Correct	C. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect
MC	<p>3e5f_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>3e5f_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.0</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect
MC	<p>3f97_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Correct	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>3f97_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.0</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Correct
MC	<p>4022_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.5</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>4022_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.5</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect
MC	<p>40bb_9577</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Correct	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Incorrect
MC	<p>40bb_f719</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Correct
MC	<p>40c9_9577</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 1.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Correct	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Incorrect
MC	<p>40c9_f719</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 1.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Correct
MC	<p>5409_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>5409_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>55b3_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>55b3_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>55c1_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Correct
MC	<p>55c1_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Correct	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>5c68_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Correct
MC	<p>5c68_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Correct	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect
MC	<p>5c8c_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Correct	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect
MC	<p>5c8c_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Correct	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect
MC	<p>5cfe_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Correct	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect
MC	<p>5cfe_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Correct
MC	<p>684d_9577</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Correct	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Incorrect
MC	<p>684d_f719</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Correct
MC	<p>68a6_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 12.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>68a6_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 12.0</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect
MC	<p>68d4_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Correct
MC	<p>68d4_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 11.0</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect
MC	<p>747a_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Correct	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect
MC	<p>747a_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Correct	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect
MC	<p>749e_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Correct
MC	<p>749e_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 2.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Correct	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect
MC	<p>74ec_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 1.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Correct
MC	<p>74ec_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 1.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Correct	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Incorrect
MC	<p>7cff_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.5</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>7cff_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.5</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>7d37_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.5</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Correct
MC	<p>7d37_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 4.5</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Correct	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>7d45_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.5</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>7d45_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.5</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>8439_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Correct	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect
MC	<p>8439_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Correct
MC	<p>8cce_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.5</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>8cce_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.5</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>8d74_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.5</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>8d74_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.5</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>9898_9577</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Incorrect	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Correct
MC	<p>9898_f719</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Correct	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Incorrect
MC	<p>98ea_9577</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Incorrect	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Correct
MC	<p>98ea_f719</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Correct	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Incorrect
MC	<p>a438_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>a438_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 9.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>a582_9a48</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect
MC	<p>a582_fb67</p> <p><strong>Uric acid</strong> and its conjugate base, urate, is an end product of nucleotide purine metabolism..</p> <p>Uric acid is diprotic with pK<sub>a</sub> values of <strong>5.40</strong> and <strong>10.30</strong>.</p> <p>Uric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #00008B">C<sub>5</sub>H<sub>4</sub>N<sub>4</sub>O<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">C<sub>5</sub>H<sub>3</sub>N<sub>4</sub>O<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">C<sub>5</sub>H<sub>2</sub>N<sub>4</sub>O<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>accf_0ef1</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Correct	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect
MC	<p>accf_623b</p> <p><strong>Malic acid</strong> and its conjugate base, malate, is the main acid in many fruits and is an intermediate in the citric acid cycle.</p> <p>Malic acid is diprotic with pK<sub>a</sub> values of <strong>3.40</strong> and <strong>5.20</strong>.</p> <p>Malic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #00008B">(COOH)CH<sub>2</sub>CH(OH)COOH</span>	Incorrect	B. <span style="color: #404040">(COOH)CH<sub>2</sub>CH(OH)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH<sub>2</sub>CH(OH)COO<sup>2-</sup></span>	Correct
MC	<p>b06e_9577</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.5</strong>?</p>	A. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Incorrect	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Correct
MC	<p>b06e_f719</p> <p><strong>Fumaric acid</strong> and its conjugate base, fumarate, is produced by human skin when exposed to sunlight and is an intermediate in the citric acid cycle.</p> <p>Fumaric acid is diprotic with pK<sub>a</sub> values of <strong>3.03</strong> and <strong>4.44</strong>.</p> <p>Fumaric acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.5</strong>?</p>	A. <span style="color: #8B0000">(COO)CH=CH(COO)<sup>2-</sup></span>	Correct	B. <span style="color: #404040">(COOH)CH=CH(COO)<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)CH=CH(COOH)</span>	Incorrect
MC	<p>c315_1b50</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 3.0</strong>?</p>	A. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Correct	C. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect
MC	<p>c315_ea1c</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 3.0</strong>?</p>	A. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Correct	C. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Incorrect
MC	<p>c383_1b50</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect
MC	<p>c383_ea1c</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 6.0</strong>?</p>	A. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Correct
MC	<p>c3f1_1b50</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.0</strong>?</p>	A. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Correct	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect
MC	<p>c3f1_ea1c</p> <p><strong>Oxalic acid</strong> and its conjugate base, oxalate, is found in many plants and vegetables and is a product of metabolic processes.</p> <p>Oxalic acid is diprotic with pK<sub>a</sub> values of <strong>1.27</strong> and <strong>4.28</strong>.</p> <p>Oxalic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 5.0</strong>?</p>	A. <span style="color: #00008B">(COOH)<sub>2</sub></span>	Incorrect	B. <span style="color: #404040">(HOOC)COO<sup>-</sup></span>	Incorrect	C. <span style="color: #8B0000">(COO)<sub>2</sub><sup>2-</sup></span>	Correct
MC	<p>ce6e_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect
MC	<p>ce6e_b697</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 8.0</strong>?</p>	A. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect
MC	<p>cfd4_3792</p> <p><strong>Carbonic acid</strong> and its conjugate base, carbonate, is also known as respiratory acid as it is the only acid excreted as a gas by the lungs.</p> <p>Carbonic acid is diprotic with pK<sub>a</sub> values of <strong>6.35</strong> and <strong>10.33</strong>.</p> <p>Carbonic acid has three possible protonation states in the choices below.</p> <p>Which one of the following protonation states is the most abundant at <strong>pH 7.0</strong>?</p>	A. <span style="color: #00008B">H<sub>2</sub>CO<sub>3</sub></span>	Incorrect	B. <span style="color: #404040">HCO<sub>3</sub><sup>-</sup></span>	Correct	C. <span style="color: #8B0000">CO<sub>3</sub><sup>2-</sup></span>	Incorrect