An aqueous solution of an acid (0.20 mol dm-3) is added slowly from a burette to 20 cm3 of an aqueous base (0.20 mol dm-3). Which acid–base combination will produce a mixture with the highest pH at the equivalence point at 298 K?
Hydrochloric acid and methylamine
Propanoic acid and sodium hydroxide
Nitric acid and potassium hydroxide
Ethanoic acid and ammonia
77 exam-style questions on AQA A Level Chemistry Acids and bases (A-level only), covering Brønsted–Lowry acid–base equilibria in aqueous solution (A-level only), Definition and determination of pH (A-level only), The ionic product of water, $K_w$ (A-level only), Weak acids and bases $K_a$ for weak acids (A-level only), pH curves, titrations and indicators (A-level only), and Buffer action (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.