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What mass of concentrated nitric acid solution is required to make 250 mL of 2.0 M HNO3, if the concentrated acid contains 70% HNO3 by mass?

1. 90.0 g concentrated HNO3 solution
2. 70.0 g concentrated HNO3 solution
3. 54.0 g concentrated HNO3 solution
4. 45.0 g concentrated HNO3 solution

Correct answer: 45.0 g concentrated HNO3 solution

Solution

Need 0.5 mol HNO3 = 31.5 g; at 70% w/w the solution mass = 31.5/0.70 = 45 g, not 70 g.

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