Lesson: Chapter 3 — Mixtures

Concentration 1 of 5 Reset answers

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Question 1

1 dm³ of a saline solution contains 5 g of sodium chloride. What is its composition in m/v terms?

A 0.2 g dm^-3 B 5 g C 5 D 5 g dm^-3

The right answer is the one marked above.

5 g dm^-3. 5 g ÷ 1 dm³ = 5 g dm⁻³.

Unlike a fraction, this one has units and they are not optional. The same solution is 5 g dm⁻³ or 0.005 g cm⁻³ depending on the volume unit used, so a bare number says nothing.

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