This lesson includes 15 additional questions and 39 additional question variations for subscribers.

# Lesson Worksheet: Percentage Concentration Chemistry

In this worksheet, we will practice expressing and calculating the percentage concentration of a solution by its volume or mass ratio.

**Q1: **

A 250 mL solution of hand sanitizer contains 150 mL of propan-2-ol. What is the percentage concentration by volume of propan-2-ol in this solution? Give your answer to the nearest whole percentage.

- A(v/v)
- B(v/v)
- C(v/v)
- D(v/v)
- E(v/v)

**Q3: **

What volume of water must be added to a 125 mL solution of ethanol to change its percentage volume from (v/v) to (v/v)? Give your answer to the nearest whole number.

**Q4: **

50 g of an anti-inflammatory ointment was found to contain 1.1 g of the main active ingredient. What is the percent by mass of the active ingredient in this ointment?

- A (m/m)
- B (m/m)
- C (m/m)
- D (m/m)
- E (m/m)

**Q5: **

50 g of a (m/m) solution was mixed together with 130 g of a (m/m) solution. What is the percentage concentration by mass of the new solution?

- A (m/m)
- B (m/m)
- C (m/m)
- D (m/m)
- E (m/m)

**Q6: **

A 0.75 L bottle of vinegar contains (v/v) of ethanoic acid. What volume of ethanoic acid does the bottle of vinegar contain? Give your answer to two decimal places.

**Q7: **

A 30 g tube of antiseptic cream contains (w/w) of cetrimide. What mass of cetrimide does the cream contain?

**Q8: **

Which of the following equations can be used to calculate the percentage by volume, , of a solution?

- A
- B
- C
- D
- E

**Q9: **

Which of the following equations can be used to calculate the percentage by mass, , of a solution?

- A
- B
- C
- D
- E

**Q10: **

A saline solution was prepared by dissolving 9 g of in water to produce a solution with a total volume of 1,000 mL. What is the mass/volume percentage concentration, (m/v), of the saline solution?