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

Exam questions on Bronsted-Lowry acids and bases and pH

1. Ethanoic acid dissolves in water and reaches the equilibrium CH₃COOH + H₂O ⇌ CH₃COO⁻ + H₃O⁺.
   Identify the two conjugate acid–base pairs in this equilibrium.2 marks
2. A swimming-pool technician lowers the pH of pool water by dosing it with dilute hydrochloric acid. Treat hydrochloric acid as fully dissociated, and assume all solutions are at 25 °C.
   A technician dilutes 25.0 cm³ of 0.0800 mol dm⁻³ hydrochloric acid with water to a total volume of 1.00 dm³. Calculate the pH of the diluted solution.2 marks
3. A student compares two acid solutions at 25 °C, each of concentration 0.100 mol dm⁻³: hydrochloric acid and ethanoic acid. The pH of the ethanoic acid solution is measured as 2.88.
   Calculate the pH of the hydrochloric acid and explain why the ethanoic acid has a higher pH at the same concentration.3 marks