Lesson: Chapter 3 — Mixtures

3.2. The composition of a mixture 4 of 6 Reset answers

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Question 4

What volume of acetic acid is needed to make 500 cm³ of an aqueous solution of composition 1/25 (v/v)?

A 25 cm³ B 20 cm³ C 500 cm³ D 5 cm³

The right answer is the one marked above.

20 cm³. (1 ÷ 25) × 500 cm³ = 20 cm³.

Note the order of the preparation: measure out 20 cm³ of acid and then add water until the total reaches 500 cm³ — not 20 cm³ of acid plus 500 cm³ of water.

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