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What volume (in litres) of 98% w/w sulphuric acid (density = 1.8 g/mL) is needed so that, after dilution, it yields 12.6 L of 2.0 M H2SO4 solution?

1. 1.4 L
2. 1.0 L
3. 2.8 L
4. 0.7 L

Correct answer: 1.4 L

Solution

The concentrated acid is ~18 M; to supply 25.2 mol of H2SO4 you need 25.2/18 = 1.4 L of concentrated acid.

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