Lesson: Chapter 3 — Mixtures

Concentration 3 of 5 Reset answers

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Question 3

2 dm³ of a solution contains 4 moles of sodium hydroxide. What is the concentration?

A 8 mol dm^-3 B 2 mol dm^-3 C 4 mol dm^-3 D 0.5 mol dm^-3

The right answer is the one marked above.

2 mol dm^-3. C = n ÷ V = 4 mol ÷ 2 dm³ = 2 mol dm⁻³.

Twice the volume at the same amount means half the concentration. Getting 8 means the two were multiplied instead of divided.

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