plumiBrønsted–Lowry acid–base equilibria in aqueous solution: AQA A‑Level Chemistry questions
AQA A-Level Chemistry past-paper questions on 3.1.12.1 Brønsted–Lowry acid–base equilibria in aqueous solution, 2008–2025, with mark schemes and examiner’s reports where available.
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Q09.6
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All 24 questions on Brønsted–Lowry acid–base equilibria in aqueous solution, as a list
- June 2024, Paper 1, Q09.6 (1 mark): Give the equation for the reaction between H3PO4 and an excess of NaOH [1 mark]
- June 2023, Paper 3, Q16 (1 mark): Which species can behave as a Brønsted–Lowry acid in aqueous solution? [1 mark] A SO42− B HCO3− C BF3 D NH3
- June 2022, Paper 3, Q13 (1 mark): Which can not function as a Brønsted-Lowry acid? [1 mark] A CH3COO– B HCO3– C H3O+ D NH4+
- June 2019, Paper 3, Q02.2 (2 marks): In aqueous solution, sulfuric acid acts as a strong acid. The H2SO4 dissociates to form HSO4 − ions and H+ ions. The HSO4 − ions act as a weak acid and dissocia
- June 2018, Paper 1, Q05.1 (1 mark): State the meaning of the term strong acid. [1 mark]
- June 2016, CHEM4 (old spec), Q1(a) (1 mark): Write an equation to show how ethanoic acid behaves as a weak acid in its reaction with water. [1 mark]
- June 2016, CHEM4 (old spec), Q1(b) (1 mark): When pure ethanoic acid reacts with pure nitric acid, ethanoic acid acts as a base. Write an equation for this reaction. [1 mark] 3 3
- June 2013, CHEM4 (old spec), Q3(a) (1 mark): State the meaning of the term Brønsted–Lowry acid. (1 mark)
- January 2013, CHEM1 (old spec), Q5(f) (1 mark): Ammonia reacts with nitric acid as shown in this equation. NH3 + HNO3 → NH4NO3 Deduce the type of reaction occurring. (1 mark)
- June 2012, CHEM4 (old spec), Q3(a) (1 mark): Define the term Brønsted–Lowry acid. (1 mark)
- June 2012, CHEM4 (old spec), Q3(b)(i) (1 mark): CH3COOH + H2O CH3COO– + H3O+ (1 mark)
- June 2012, CHEM4 (old spec), Q3(b)(ii) (1 mark): CH3NH2 + H2O CH3NH3+ + OH– (1 mark)
- June 2012, CHEM4 (old spec), Q3(b)(iii) (1 mark): HNO3 + H2SO4 H2NO3+ + HSO4– (1 mark) 3 3
- January 2012, CHEM4 (old spec), Q3(a) (1 mark): State the meaning of the term Brønsted–Lowry base. (1 mark)
- January 2012, CHEM4 (old spec), Q3(b)(i) (1 mark): Write an equation for the reaction of ethylamine (CH3CH2NH2) with water to form a weakly alkaline solution. (1 mark)
- June 2011, CHEM1 (old spec), Q2(a)(iv) (1 mark): State the type of reaction that occurs when calcium carbonate reacts with nitric acid. (1 mark)
- June 2010, CHEM4 (old spec), Q1(d)(ii) (1 mark): Deduce the role of ethanal in Step 1. (1 mark)
- January 2010, CHEM4 (old spec), Q2(b)(i) (1 mark): Write an equation for the reaction between sodium hydroxide and ethanoic acid. (1 mark) 3
- January 2010, CHEM4 (old spec), Q2(b)(iv) (1 mark): Suggest why the concentration of sodium hydroxide in a solution slowly decreases when left open to air. (1 mark)
- June 2008, CHM4 (2008 spec), Q1(c) (6 marks): 1 (c) HX is a weak Brønsted–Lowry acid. 1 (c) (i) Explain the terms weak and Brønsted–Lowry acid as applied to HX. Weak Brønsted–Lowry acid 1 (c) (ii) Write an
- June 2008, CHM5 (2008 spec), Q1(a) (1 mark): 1 (a) Define the term Brønsted–Lowry base. (1 mark)
- June 2008, CHM5 (2008 spec), Q1(d) (1 mark): 1 (d) Write an ionic equation for the reaction between ammonia and hydrochloric acid in which the ammonia acts as a Brønsted–Lowry base. (1 mark)
- June 2008, CHM6W (2008 spec), Q4 (1 mark): 4 a solution of a strong acid?
- June 2008, CHM6W (2008 spec), Q5 (1 mark): 5 a solution of a salt formed by neutralising a strong acid with sodium hydroxide?
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