Bronsted-Lowry acids and bases and pHEdexcel A-Level Chemistry: Mind map

Exam questions on Bronsted-Lowry acids and bases and pH

1. A student mixes aqueous ethanoic acid with aqueous ammonia: CH₃COOH(aq) + NH₃(aq) ⇌ CH₃COO⁻(aq) + NH₄⁺(aq).
   Identify the two conjugate acid–base pairs in this equilibrium, stating which species in each pair is the acid and which is the base.2 marks
2. A school technician prepares solutions of strong monoprotic acids for a practical. All measurements are made at 298 K.
   The technician dilutes 25.0 cm³ of 0.200 mol dm⁻³ hydrochloric acid to a final volume of 500 cm³. Calculate the pH of the diluted solution.2 marks
3. A student has equimolar 0.100 mol dm⁻³ solutions of nitric acid, a strong acid, and methanoic acid, a weak acid. At 298 K the pH of the nitric acid is 1.00 and the pH of the methanoic acid is 2.38.
   Use the pH values to show that nitric acid is a strong acid and methanoic acid is a weak acid.3 marks