NUM

ab09_6229

Potassium chloride (KCl)
Final volume	750 μL
Target concentration	80%
Stock concentration	100%
Molecular weight	74.55 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 100% KCl on the shelf.

Prepare 750 μL of 80% KCl solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

600.00000000 0.90000000 NUM

a787_ba13

Magnesium sulfate (MgSO₄)
Final volume	640 mL
Target concentration	30%
Stock concentration	80%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 80% MgSO₄ on the shelf.

Prepare 640 mL of 30% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

240.00000000 0.90000000 NUM

07cf_14ef

Potassium chloride (KCl)
Final volume	350 mL
Target concentration	100%
Stock concentration	140%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 140% KCl on the shelf.

Prepare 350 mL of 100% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

250.00000000 0.90000000 NUM

e626_e728

Sodium bicarbonate (NaHCO₃)
Final volume	810 μL
Target concentration	200%
Stock concentration	450%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 450% NaHCO₃ on the shelf.

Prepare 810 μL of 200% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

c332_2658

Ethylenediaminetetraacetic acid (EDTA)
Final volume	120 μL
Target concentration	30%
Stock concentration	40%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 40% EDTA on the shelf.

Prepare 120 μL of 30% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

90.00000000 0.90000000 NUM

6f0d_530f

Ethylenediaminetetraacetic acid (EDTA)
Final volume	800 mL
Target concentration	125%
Stock concentration	200%
Molecular weight	292.24 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 200% EDTA on the shelf.

Prepare 800 mL of 125% EDTA solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

500.00000000 0.90000000 NUM

8f03_25c9

Calcium carbonate (CaCO₃)
Final volume	270 μL
Target concentration	40%
Stock concentration	72%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 72% CaCO₃ on the shelf.

Prepare 270 μL of 40% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

150.00000000 0.90000000 NUM

9848_76a3

Calcium carbonate (CaCO₃)
Final volume	600 μL
Target concentration	15%
Stock concentration	20%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 20% CaCO₃ on the shelf.

Prepare 600 μL of 15% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

450.00000000 0.90000000 NUM

d5c3_e2c0

Sodium chloride (NaCl)
Final volume	80 mL
Target concentration	40%
Stock concentration	64%
Molecular weight	58.44 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 64% NaCl on the shelf.

Prepare 80 mL of 40% NaCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

50.00000000 0.90000000 NUM

a427_6229

Magnesium sulfate (MgSO₄)
Final volume	720 μL
Target concentration	100%
Stock concentration	120%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 120% MgSO₄ on the shelf.

Prepare 720 μL of 100% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

600.00000000 0.90000000 NUM

9e97_64a8

Sodium bicarbonate (NaHCO₃)
Final volume	840 mL
Target concentration	20%
Stock concentration	35%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 35% NaHCO₃ on the shelf.

Prepare 840 mL of 20% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

480.00000000 0.90000000 NUM

b802_1087

Calcium carbonate (CaCO₃)
Final volume	160 mL
Target concentration	25%
Stock concentration	40%
Molecular weight	100.09 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 40% CaCO₃ on the shelf.

Prepare 160 mL of 25% CaCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

100.00000000 0.90000000 NUM

844e_f222

Sodium bicarbonate (NaHCO₃)
Final volume	70 mL
Target concentration	20%
Stock concentration	35%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 35% NaHCO₃ on the shelf.

Prepare 70 mL of 20% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 3% of the correct number to be correct.

40.00000000 0.90000000 NUM

6eaa_37c2

Magnesium sulfate (MgSO₄)
Final volume	300 mL
Target concentration	60%
Stock concentration	100%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 100% MgSO₄ on the shelf.

Prepare 300 mL of 60% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

180.00000000 0.90000000 NUM

1695_76a3

Potassium chloride (KCl)
Final volume	720 μL
Target concentration	100%
Stock concentration	160%
Molecular weight	74.55 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 160% KCl on the shelf.

Prepare 720 μL of 100% KCl solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

450.00000000 0.90000000 NUM

1c7e_c6ec

Sodium chloride (NaCl)
Final volume	280 mL
Target concentration	32%
Stock concentration	56%
Molecular weight	58.44 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 56% NaCl on the shelf.

Prepare 280 mL of 32% NaCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

160.00000000 0.90000000 NUM

da0f_e728

Magnesium sulfate (MgSO₄)
Final volume	960 μL
Target concentration	24%
Stock concentration	64%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 64% MgSO₄ on the shelf.

Prepare 960 μL of 24% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

8420_6229

Potassium chloride (KCl)
Final volume	800 mL
Target concentration	12%
Stock concentration	16%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 16% KCl on the shelf.

Prepare 800 mL of 12% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

600.00000000 0.90000000 NUM

7b0c_21a1

Sodium bicarbonate (NaHCO₃)
Final volume	350 mL
Target concentration	32%
Stock concentration	56%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 56% NaHCO₃ on the shelf.

Prepare 350 mL of 32% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

200.00000000 0.90000000 NUM

6700_ba13

Ethylenediaminetetraacetic acid (EDTA)
Final volume	400 μL
Target concentration	12%
Stock concentration	20%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 20% EDTA on the shelf.

Prepare 400 μL of 12% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

240.00000000 0.90000000 NUM

1780_fdf3

Magnesium sulfate (MgSO₄)
Final volume	680 mL
Target concentration	120%
Stock concentration	160%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 160% MgSO₄ on the shelf.

Prepare 680 mL of 120% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

510.00000000 0.90000000 NUM

9ea3_8564

Sodium chloride (NaCl)
Final volume	980 μL
Target concentration	200%
Stock concentration	350%
Molecular weight	58.44 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 350% NaCl on the shelf.

Prepare 980 μL of 200% NaCl solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

560.00000000 0.90000000 NUM

484a_2b98

Monosodium phosphate (NaH₂PO₄)
Final volume	950 μL
Target concentration	120%
Stock concentration	200%
Molecular weight	119.98 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 200% NaH₂PO₄ on the shelf.

Prepare 950 μL of 120% NaH₂PO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

570.00000000 0.90000000 NUM

8af5_8f5d

Magnesium chloride (MgCl₂)
Final volume	280 mL
Target concentration	75%
Stock concentration	100%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 100% MgCl₂ on the shelf.

Prepare 280 mL of 75% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

210.00000000 0.90000000 NUM

4ade_5936

Calcium carbonate (CaCO₃)
Final volume	720 μL
Target concentration	120%
Stock concentration	320%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 320% CaCO₃ on the shelf.

Prepare 720 μL of 120% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

270.00000000 0.90000000 NUM

70b2_1087

Magnesium chloride (MgCl₂)
Final volume	120 mL
Target concentration	20%
Stock concentration	24%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 24% MgCl₂ on the shelf.

Prepare 120 mL of 20% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

100.00000000 0.90000000 NUM

8ed3_d3e6

Calcium carbonate (CaCO₃)
Final volume	160 mL
Target concentration	12%
Stock concentration	32%
Molecular weight	100.09 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 32% CaCO₃ on the shelf.

Prepare 160 mL of 12% CaCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

60.00000000 0.90000000 NUM

24a4_e728

Monosodium phosphate (NaH₂PO₄)
Final volume	960 mL
Target concentration	150%
Stock concentration	400%
Molecular weight	119.98 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 400% NaH₂PO₄ on the shelf.

Prepare 960 mL of 150% NaH₂PO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

4854_b8fa

Potassium chloride (KCl)
Final volume	910 mL
Target concentration	15%
Stock concentration	35%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 35% KCl on the shelf.

Prepare 910 mL of 15% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

390.00000000 0.90000000 NUM

b473_040d

Ethylenediaminetetraacetic acid (EDTA)
Final volume	490 μL
Target concentration	200%
Stock concentration	280%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 280% EDTA on the shelf.

Prepare 490 μL of 200% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

350.00000000 0.90000000 NUM

c34e_6641

Sodium bicarbonate (NaHCO₃)
Final volume	660 μL
Target concentration	100%
Stock concentration	120%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 120% NaHCO₃ on the shelf.

Prepare 660 μL of 100% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

550.00000000 0.90000000 NUM

a531_530f

Magnesium chloride (MgCl₂)
Final volume	700 mL
Target concentration	25%
Stock concentration	35%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 35% MgCl₂ on the shelf.

Prepare 700 mL of 25% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

500.00000000 0.90000000 NUM

249b_14ef

Magnesium chloride (MgCl₂)
Final volume	450 μL
Target concentration	50%
Stock concentration	90%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 90% MgCl₂ on the shelf.

Prepare 450 μL of 50% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

250.00000000 0.90000000 NUM

39d6_c6ec

Calcium carbonate (CaCO₃)
Final volume	360 μL
Target concentration	40%
Stock concentration	90%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 90% CaCO₃ on the shelf.

Prepare 360 μL of 40% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

160.00000000 0.90000000 NUM

1eef_e728

Magnesium sulfate (MgSO₄)
Final volume	960 mL
Target concentration	150%
Stock concentration	400%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 400% MgSO₄ on the shelf.

Prepare 960 mL of 150% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

0789_3143

Sodium bicarbonate (NaHCO₃)
Final volume	800 μL
Target concentration	12%
Stock concentration	32%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 32% NaHCO₃ on the shelf.

Prepare 800 μL of 12% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

da6e_040d

Sodium bicarbonate (NaHCO₃)
Final volume	560 mL
Target concentration	100%
Stock concentration	160%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 160% NaHCO₃ on the shelf.

Prepare 560 mL of 100% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

350.00000000 0.90000000 NUM

dfe4_5767

Calcium carbonate (CaCO₃)
Final volume	910 μL
Target concentration	125%
Stock concentration	175%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 175% CaCO₃ on the shelf.

Prepare 910 μL of 125% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

650.00000000 0.90000000 NUM

f6b3_8f5d

Calcium carbonate (CaCO₃)
Final volume	280 μL
Target concentration	60%
Stock concentration	80%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 80% CaCO₃ on the shelf.

Prepare 280 μL of 60% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

210.00000000 0.90000000 NUM

8b97_8f5d

Monosodium phosphate (NaH₂PO₄)
Final volume	560 mL
Target concentration	15%
Stock concentration	40%
Molecular weight	119.98 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 40% NaH₂PO₄ on the shelf.

Prepare 560 mL of 15% NaH₂PO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

210.00000000 0.90000000 NUM

6bc3_e2c0

Magnesium sulfate (MgSO₄)
Final volume	70 mL
Target concentration	20%
Stock concentration	28%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 28% MgSO₄ on the shelf.

Prepare 70 mL of 20% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

50.00000000 0.90000000 NUM

384e_7c9a

Sodium chloride (NaCl)
Final volume	720 mL
Target concentration	100%
Stock concentration	225%
Molecular weight	58.44 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 225% NaCl on the shelf.

Prepare 720 mL of 100% NaCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

320.00000000 0.90000000 NUM

a2aa_d3e6

Magnesium sulfate (MgSO₄)
Final volume	160 mL
Target concentration	60%
Stock concentration	160%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 160% MgSO₄ on the shelf.

Prepare 160 mL of 60% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

60.00000000 0.90000000 NUM

792b_72cb

Magnesium chloride (MgCl₂)
Final volume	840 μL
Target concentration	25%
Stock concentration	30%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 30% MgCl₂ on the shelf.

Prepare 840 μL of 25% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

700.00000000 0.90000000 NUM

c8f5_14ef

Calcium carbonate (CaCO₃)
Final volume	350 mL
Target concentration	25%
Stock concentration	35%
Molecular weight	100.09 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 35% CaCO₃ on the shelf.

Prepare 350 mL of 25% CaCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

250.00000000 0.90000000 NUM

2541_43ed

Magnesium chloride (MgCl₂)
Final volume	720 mL
Target concentration	100%
Stock concentration	180%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 180% MgCl₂ on the shelf.

Prepare 720 mL of 100% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

400.00000000 0.90000000 NUM

2dfb_25c9

Magnesium sulfate (MgSO₄)
Final volume	240 μL
Target concentration	40%
Stock concentration	64%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 64% MgSO₄ on the shelf.

Prepare 240 μL of 40% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

150.00000000 0.90000000 NUM

9a43_3143

Monosodium phosphate (NaH₂PO₄)
Final volume	480 mL
Target concentration	250%
Stock concentration	400%
Molecular weight	119.98 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 400% NaH₂PO₄ on the shelf.

Prepare 480 mL of 250% NaH₂PO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

afa8_1087

Potassium chloride (KCl)
Final volume	120 mL
Target concentration	20%
Stock concentration	24%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 24% KCl on the shelf.

Prepare 120 mL of 20% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

100.00000000 0.90000000 NUM

b9cf_e728

Monosodium phosphate (NaH₂PO₄)
Final volume	480 μL
Target concentration	15%
Stock concentration	20%
Molecular weight	119.98 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 20% NaH₂PO₄ on the shelf.

Prepare 480 μL of 15% NaH₂PO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

194d_e728

Magnesium sulfate (MgSO₄)
Final volume	810 mL
Target concentration	40%
Stock concentration	90%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 90% MgSO₄ on the shelf.

Prepare 810 mL of 40% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

4eef_808c

Magnesium chloride (MgCl₂)
Final volume	80 mL
Target concentration	150%
Stock concentration	400%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 400% MgCl₂ on the shelf.

Prepare 80 mL of 150% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 4% of the correct number to be correct.

30.00000000 0.90000000 NUM

4a88_c6ec

Magnesium chloride (MgCl₂)
Final volume	360 mL
Target concentration	80%
Stock concentration	180%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 180% MgCl₂ on the shelf.

Prepare 360 mL of 80% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

160.00000000 0.90000000 NUM

78f8_8775

Sodium chloride (NaCl)
Final volume	1000 mL
Target concentration	32%
Stock concentration	40%
Molecular weight	58.44 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 40% NaCl on the shelf.

Prepare 1000 mL of 32% NaCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

800.00000000 0.90000000 NUM

4ceb_c6ec

Calcium carbonate (CaCO₃)
Final volume	360 mL
Target concentration	160%
Stock concentration	360%
Molecular weight	100.09 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 360% CaCO₃ on the shelf.

Prepare 360 mL of 160% CaCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

160.00000000 0.90000000 NUM

aba6_d85f

Magnesium sulfate (MgSO₄)
Final volume	990 μL
Target concentration	160%
Stock concentration	360%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 360% MgSO₄ on the shelf.

Prepare 990 μL of 160% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

440.00000000 0.90000000 NUM

047b_1ed6

Ethylenediaminetetraacetic acid (EDTA)
Final volume	910 μL
Target concentration	160%
Stock concentration	280%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 280% EDTA on the shelf.

Prepare 910 μL of 160% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

520.00000000 0.90000000 NUM

61ee_e2c0

Magnesium chloride (MgCl₂)
Final volume	90 μL
Target concentration	50%
Stock concentration	90%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 90% MgCl₂ on the shelf.

Prepare 90 μL of 50% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

50.00000000 0.90000000 NUM

ed08_76a3

Calcium carbonate (CaCO₃)
Final volume	540 mL
Target concentration	125%
Stock concentration	150%
Molecular weight	100.09 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 150% CaCO₃ on the shelf.

Prepare 540 mL of 125% CaCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

450.00000000 0.90000000 NUM

8d15_e728

Magnesium chloride (MgCl₂)
Final volume	630 μL
Target concentration	32%
Stock concentration	56%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 56% MgCl₂ on the shelf.

Prepare 630 μL of 32% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

a299_b8fa

Ethylenediaminetetraacetic acid (EDTA)
Final volume	520 μL
Target concentration	60%
Stock concentration	80%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 80% EDTA on the shelf.

Prepare 520 μL of 60% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

390.00000000 0.90000000 NUM

cb6f_040d

Sodium chloride (NaCl)
Final volume	420 μL
Target concentration	200%
Stock concentration	240%
Molecular weight	58.44 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 240% NaCl on the shelf.

Prepare 420 μL of 200% NaCl solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

350.00000000 0.90000000 NUM

cc98_64a8

Sodium chloride (NaCl)
Final volume	600 μL
Target concentration	16%
Stock concentration	20%
Molecular weight	58.44 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 20% NaCl on the shelf.

Prepare 600 μL of 16% NaCl solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

480.00000000 0.90000000 NUM

0427_5d5e

Magnesium sulfate (MgSO₄)
Final volume	270 μL
Target concentration	160%
Stock concentration	360%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 360% MgSO₄ on the shelf.

Prepare 270 μL of 160% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

120.00000000 0.90000000 NUM

3db2_ba13

Magnesium chloride (MgCl₂)
Final volume	300 mL
Target concentration	160%
Stock concentration	200%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 200% MgCl₂ on the shelf.

Prepare 300 mL of 160% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

240.00000000 0.90000000 NUM

cc04_36ba

Magnesium chloride (MgCl₂)
Final volume	180 μL
Target concentration	100%
Stock concentration	225%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 225% MgCl₂ on the shelf.

Prepare 180 μL of 100% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

80.00000000 0.90000000 NUM

a654_8f5d

Magnesium sulfate (MgSO₄)
Final volume	490 mL
Target concentration	60%
Stock concentration	140%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 140% MgSO₄ on the shelf.

Prepare 490 mL of 60% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

210.00000000 0.90000000 NUM

6e4c_36ba

Sodium bicarbonate (NaHCO₃)
Final volume	180 mL
Target concentration	16%
Stock concentration	36%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 36% NaHCO₃ on the shelf.

Prepare 180 mL of 16% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

80.00000000 0.90000000 NUM

ca15_808c

Magnesium sulfate (MgSO₄)
Final volume	50 mL
Target concentration	120%
Stock concentration	200%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 200% MgSO₄ on the shelf.

Prepare 50 mL of 120% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 4% of the correct number to be correct.

30.00000000 0.90000000 NUM

ddea_e728

Magnesium chloride (MgCl₂)
Final volume	840 μL
Target concentration	12%
Stock concentration	28%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 28% MgCl₂ on the shelf.

Prepare 840 μL of 12% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

360.00000000 0.90000000 NUM

37cf_8f5d

Magnesium chloride (MgCl₂)
Final volume	490 μL
Target concentration	150%
Stock concentration	350%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 350% MgCl₂ on the shelf.

Prepare 490 μL of 150% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

210.00000000 0.90000000 NUM

360b_5d5e

Magnesium sulfate (MgSO₄)
Final volume	270 μL
Target concentration	100%
Stock concentration	225%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 225% MgSO₄ on the shelf.

Prepare 270 μL of 100% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

120.00000000 0.90000000 NUM

98d2_72cb

Magnesium sulfate (MgSO₄)
Final volume	840 mL
Target concentration	50%
Stock concentration	60%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 60% MgSO₄ on the shelf.

Prepare 840 mL of 50% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

700.00000000 0.90000000 NUM

9c42_3143

Sodium bicarbonate (NaHCO₃)
Final volume	420 mL
Target concentration	250%
Stock concentration	350%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 350% NaHCO₃ on the shelf.

Prepare 420 mL of 250% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

bfac_c6ec

Magnesium sulfate (MgSO₄)
Final volume	360 mL
Target concentration	160%
Stock concentration	360%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 360% MgSO₄ on the shelf.

Prepare 360 mL of 160% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

160.00000000 0.90000000 NUM

42f2_3143

Ethylenediaminetetraacetic acid (EDTA)
Final volume	540 mL
Target concentration	50%
Stock concentration	90%
Molecular weight	292.24 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 90% EDTA on the shelf.

Prepare 540 mL of 50% EDTA solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

b6e2_3143

Calcium carbonate (CaCO₃)
Final volume	360 mL
Target concentration	250%
Stock concentration	300%
Molecular weight	100.09 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 300% CaCO₃ on the shelf.

Prepare 360 mL of 250% CaCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

ab4d_b8fa

Potassium chloride (KCl)
Final volume	650 mL
Target concentration	24%
Stock concentration	40%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 40% KCl on the shelf.

Prepare 650 mL of 24% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

390.00000000 0.90000000 NUM

fed5_8f5d

Sodium bicarbonate (NaHCO₃)
Final volume	350 μL
Target concentration	150%
Stock concentration	250%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 250% NaHCO₃ on the shelf.

Prepare 350 μL of 150% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

210.00000000 0.90000000 NUM

19fe_43ed

Sodium bicarbonate (NaHCO₃)
Final volume	560 μL
Target concentration	40%
Stock concentration	56%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 56% NaHCO₃ on the shelf.

Prepare 560 μL of 40% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

400.00000000 0.90000000 NUM

87ae_3143

Magnesium sulfate (MgSO₄)
Final volume	800 μL
Target concentration	75%
Stock concentration	200%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 200% MgSO₄ on the shelf.

Prepare 800 μL of 75% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

b198_c8bd

Potassium chloride (KCl)
Final volume	720 μL
Target concentration	150%
Stock concentration	200%
Molecular weight	74.55 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 200% KCl on the shelf.

Prepare 720 μL of 150% KCl solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

540.00000000 0.90000000 NUM

4069_808c

Ethylenediaminetetraacetic acid (EDTA)
Final volume	80 μL
Target concentration	24%
Stock concentration	64%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 64% EDTA on the shelf.

Prepare 80 μL of 24% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 4% of the correct number to be correct.

30.00000000 0.90000000 NUM

2ddf_1087

Magnesium chloride (MgCl₂)
Final volume	180 μL
Target concentration	50%
Stock concentration	90%
Molecular weight	95.21 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 90% MgCl₂ on the shelf.

Prepare 180 μL of 50% MgCl₂ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

100.00000000 0.90000000 NUM

6ed1_f222

Ethylenediaminetetraacetic acid (EDTA)
Final volume	90 mL
Target concentration	16%
Stock concentration	36%
Molecular weight	292.24 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 36% EDTA on the shelf.

Prepare 90 mL of 16% EDTA solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 3% of the correct number to be correct.

40.00000000 0.90000000 NUM

7783_37c2

Ethylenediaminetetraacetic acid (EDTA)
Final volume	240 mL
Target concentration	15%
Stock concentration	20%
Molecular weight	292.24 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 20% EDTA on the shelf.

Prepare 240 mL of 15% EDTA solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

180.00000000 0.90000000 NUM

0525_5d5e

Magnesium sulfate (MgSO₄)
Final volume	150 μL
Target concentration	80%
Stock concentration	100%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 100% MgSO₄ on the shelf.

Prepare 150 μL of 80% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

120.00000000 0.90000000 NUM

120a_6641

Sodium bicarbonate (NaHCO₃)
Final volume	880 μL
Target concentration	125%
Stock concentration	200%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 200% NaHCO₃ on the shelf.

Prepare 880 μL of 125% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

550.00000000 0.90000000 NUM

893a_36ba

Magnesium sulfate (MgSO₄)
Final volume	100 μL
Target concentration	200%
Stock concentration	250%
Molecular weight	120.37 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 250% MgSO₄ on the shelf.

Prepare 100 μL of 200% MgSO₄ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 2% of the correct number to be correct.

80.00000000 0.90000000 NUM

3570_f222

Calcium carbonate (CaCO₃)
Final volume	90 μL
Target concentration	80%
Stock concentration	180%
Molecular weight	100.09 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 180% CaCO₃ on the shelf.

Prepare 90 μL of 80% CaCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 3% of the correct number to be correct.

40.00000000 0.90000000 NUM

6c61_d85f

Magnesium chloride (MgCl₂)
Final volume	550 mL
Target concentration	80%
Stock concentration	100%
Molecular weight	95.21 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 100% MgCl₂ on the shelf.

Prepare 550 mL of 80% MgCl₂ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

440.00000000 0.90000000 NUM

dda4_3143

Sodium chloride (NaCl)
Final volume	360 mL
Target concentration	250%
Stock concentration	300%
Molecular weight	58.44 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 300% NaCl on the shelf.

Prepare 360 mL of 250% NaCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

32ea_3143

Sodium bicarbonate (NaHCO₃)
Final volume	420 mL
Target concentration	40%
Stock concentration	56%
Molecular weight	84.01 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 56% NaHCO₃ on the shelf.

Prepare 420 mL of 40% NaHCO₃ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

300.00000000 0.90000000 NUM

e9d4_d85f

Ethylenediaminetetraacetic acid (EDTA)
Final volume	770 μL
Target concentration	160%
Stock concentration	280%
Molecular weight	292.24 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 280% EDTA on the shelf.

Prepare 770 μL of 160% EDTA solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

440.00000000 0.90000000 NUM

57ac_8775

Potassium chloride (KCl)
Final volume	960 mL
Target concentration	25%
Stock concentration	30%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 30% KCl on the shelf.

Prepare 960 mL of 25% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

800.00000000 0.90000000 NUM

9ed4_ba13

Magnesium sulfate (MgSO₄)
Final volume	640 mL
Target concentration	60%
Stock concentration	160%
Molecular weight	120.37 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 160% MgSO₄ on the shelf.

Prepare 640 mL of 60% MgSO₄ solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

240.00000000 0.90000000 NUM

8e69_2658

Sodium bicarbonate (NaHCO₃)
Final volume	150 μL
Target concentration	60%
Stock concentration	100%
Molecular weight	84.01 g/mol
Aliquot unit	microliters (μL)

You have an already prepared stock solution of 100% NaHCO₃ on the shelf.

Prepare 150 μL of 60% NaHCO₃ solution using the stock solution.

What volume of aliquot in microliters (μL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

90.00000000 0.90000000 NUM

355d_7c9a

Potassium chloride (KCl)
Final volume	560 mL
Target concentration	32%
Stock concentration	56%
Molecular weight	74.55 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 56% KCl on the shelf.

Prepare 560 mL of 32% KCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

320.00000000 0.90000000 NUM

b56a_76a3

Sodium chloride (NaCl)
Final volume	540 mL
Target concentration	125%
Stock concentration	150%
Molecular weight	58.44 g/mol
Aliquot unit	milliliters (mL)

You have an already prepared stock solution of 150% NaCl on the shelf.

Prepare 540 mL of 125% NaCl solution using the stock solution.

What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?

Note: answers need to be within 1% of the correct number to be correct.

450.00000000 0.90000000