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Two litres of 9.8% w/w H2SO4 solution (density 1.5 g/mL) is mixed with three litres of 1 M KOH. After reaction, give the concentration of excess H+ if the mixture is acidic, or excess OH- if it is basic, in the final solution. (M of H2SO4 = 98)

1. 3/5
2. 0
3. 3/10
4. 2/5

Correct answer: 3/5

Solution

H2SO4 gives 6 mol H+ versus 3 mol OH-, leaving 3 mol H+ excess in 5 L, so [H+] = 3/5 = 0.6 M.

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