Chemistry · May / June 2022 · Paper 12 · Question 25

When ammonia gas is dissolved in water a reversible reaction takes place. NH3(g) + H2O(l) ⇌ NH4+(aq) + OH–(aq) Which statements are correct? 1 Ammonia is an alkali because it produces hydroxide ions in solution. 2 The pH of this solution is 7. 3 Adding hydroxide ions to the mixture at equilibrium produces more ammonia.

1. A1, 2 and 3
2. B1 and 3 only
3. C1 only
4. D2 and 3 only

As printed in the paper