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A 3.0 molal NaOH solution has density 1.12 g/mL. Calculate its molarity.

1. 2.97 M
2. 3 M
3. 3.05 M
4. 3.5 M

Correct answer: 3 M

Solution

For 1 kg water, 3 mol NaOH (120 g) gives 1120 g solution; volume = 1120/1.12 = 1000 mL = 1.0 L, so molarity = 3/1.0 = 3 M.

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