Chemistry · Oct / Nov 2022 · Paper 11 · Question 28

Sodium sulfate, Na2SO4, and sodium hydrogensulfate, NaHSO4, can both be prepared using aqueous sodium hydroxide and sulfuric acid. 2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l) NaOH(aq) + H2SO4(aq) → NaHSO4(aq) + H2O(l) 50 cm3 of 1 mol / dm3 sodium hydroxide is used each time. Which row shows the correct volumes of 1 mol / dm3 sulfuric acid required to prepare a sample of sodium sulfate and a sample of sodium hydrogensulfate?

1. Avolume of sulfuric acid required to make sodium sulfate / cm3: 25; volume of sulfuric acid required to make sodium hydrogensulfate / cm3: 50
2. Bvolume of sulfuric acid required to make sodium sulfate / cm3: 25; volume of sulfuric acid required to make sodium hydrogensulfate / cm3: 12.5
3. Cvolume of sulfuric acid required to make sodium sulfate / cm3: 50; volume of sulfuric acid required to make sodium hydrogensulfate / cm3: 12.5
4. Dvolume of sulfuric acid required to make sodium sulfate / cm3: 50; volume of sulfuric acid required to make sodium hydrogensulfate / cm3: 25

As printed in the paper