2: Solutions
Solution preparation using mass concentration, molarity, and volume ratios.
Calculating Mass for a Target Concentration
Click to show Calculating Mass for a Target Concentration example problem
| glucose | |
| Volume | 125.0 mL |
| Concentration | 8.0 mg/mL |
| Molecular weight | 180.16 g/mol |
| State | Solid powder at room temperature |
How many milligrams (mg) of glucose would you need to make 125.0 mL of a 8.0 mg/mL glucose solution?
Note: answers need to be within 1% of the correct number to be correct.
Calculating Mass for Weight/Volume Solutions
Click to show Calculating Mass for Weight/Volume Solutions example problem
| Glucose | |
| Volume | 40 mL |
| Concentration | 20% (w/v) |
| Molecular weight | 180.16 g/mol |
| State | Solid powder at room temperature |
How many grams (g) of glucose (Glucose) you would need to make 40 mL of a 20% (w/v) Glucose solution?
Note: answers need to be within 12% of the correct number to be correct.
Calculating Mass for Solutions Using Molarity and Molecular Weight
Click to show Calculating Mass for Solutions Using Molarity and Molecular Weight example problem
| sucrose | |
| Volume | 320 mL |
| Concentration | 2 mM |
| Molecular weight | 342.30 g/mol |
| State | Solid powder at room temperature |
How many milligrams (mg) of sucrose would you need to make 320 mL of a 2 mM sucrose solution?
Note: answers need to be within 1% of the correct number to be correct.
Calculating Solute Volume for Percent Volume/Volume Solutions
Click to show Calculating Solute Volume for Percent Volume/Volume Solutions example problem
| acetone | |
| Volume | 350 mL |
| Concentration | 4% (v/v) |
| Molecular weight | 58.08 g/mol |
| State | Liquid at room temperature |
How many milliliters (mL) of acetone you would need to make 350 mL of a 4% (v/v) acetone solution?
Note: answers need to be within 7% of the correct number to be correct.