plumiBrønsted–Lowry acids and bases: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 14.1.1 Brønsted–Lowry acids and bases, 2019–2025, with mark schemes and examiner’s reports where available.
All papers
All years
Q17(b)(ii)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ17(b)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ19(a)(iii)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ21(c)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ16(c)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ22(e)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ22(e)(ii)
The whole paper ↗Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ9(b)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFYour answerQ18(b)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDF
All 17 questions on Brønsted–Lowry acids and bases, as a list
- June 2025, Unit 4, Q17(b)(ii) (2 marks): When ethanoic acid and chloroethanoic acid are added together an equilibrium is set up containing two acid-base pairs. Complete the equilibrium equation, labell
- June 2025 (A), Unit 5, Q17(b) (6 marks): Amines are derived from ammonia, which is a weak base. Explain the differences in the strengths of three bases: ammonia, methylamine and phenylamine. In your an
- January 2025, Unit 4, Q3 (1 mark): When ammonia dissolves in water, an equilibrium results. The equation for this equilibrium is shown. NH3 + H2O NH+ 4 + OH– Which of these species act as a Brø
- October 2024, Unit 4, Q5 (1 mark): – . 5 Ethanoic acid, CH3COOH, can react with a hydrogensulfite ion, HSO3 Which is a correct acid conjugate‑base pair for this reaction? [Ka for ethanoic acid =
- June 2024, Unit 4, Q19(a)(iii) (2 marks): When methanoic acid is added to propanoic acid, an equilibrium is set up containing two acid‑base pairs. Complete the equilibrium, labelling the acid‑base pairs
- January 2024, Unit 4, Q9 (1 mark): Some equations for acid‑base equilibria are shown. H3PO4 + H2O H2PO4 – + H3O+ – + H2O HPO4 2– + H3O+ H2PO4 HPO4 2– + H2O PO4 3– + H3O+ 2–? What is the con
- October 2023, Unit 4, Q7 (1 mark): When concentrated hydrochloric acid is added to methanoic acid, an acid‑base reaction occurs. HCl + HCOOH Cl– + HCOOH2 + What are the Brønsted‑Lowry acid‑base
- October 2023, Unit 5, Q21(c)(i) (1 mark): Complete the equation to show the dissociation of acetylsalicylic acid in aqueous solution. (1) COOH ⇌ OCOCH3
- June 2023, Unit 4, Q15 (1 mark): Which is not a conjugate acid-base pair? A NH3 , NH2 – B NH4 + , NH3 C H2CO3 , CO3 2– D H2CO3 , HCO3 –
- January 2023, Unit 4, Q10 (1 mark): Equal amounts of ethanoic acid and methanoic acid are mixed. [pKa values: ethanoic acid = 4.8 methanoic acid = 3.8] What are the conjugate acid‑base pairs in th
- October 2022, Unit 4, Q7 (1 mark): In which equation is H2O acting only as a Brønsted–Lowry acid? A CH3COOH + H2O → CH3COO− + H3O+ + + H2O → H3O+ + NH3 B NH4 C NH3 + H2O → NH4 + + OH− D 2H2O → H3
- June 2022, Unit 4, Q16(c) (1 mark): Write an ionic equation to show why aqueous solutions of ammonium chloride are acidic. State symbols are not required. (1)
- January 2022, Unit 4, Q22(e)(i) (2 marks): Write an equation for the production of this fertiliser. State symbols are not required. (2)
- January 2022, Unit 4, Q22(e)(ii) (1 mark): Write an ionic equation to show that ammonium ions are acidic in aqueous solution. State symbols are not required. (1)
- October 2021, Unit 4, Q8 (1 mark): When ethanoic acid and chloroethanoic acid are mixed, an equilibrium is set up. CH3COOH + CH2ClCOOH CH3COOH2 + + CH2ClCOO− The Brønsted-Lowry acids in this eq
- January 2021, Unit 4, Q9(b) (1 mark): Which is the acid-conjugate base pair in the reaction between ethanoic acid and chloroethanoic acid? (1) Acid Conjugate base CH3COO− A CH3COOH + B CH3COOH CH3CO
- October 2020, Unit 4, Q18(b)(i) (2 marks): Identify the acids and bases in the spaces below Equation 2, linking the acid-base conjugate pairs. (2)
Questions, mark schemes and examiner’s reports are © Pearson Edexcel, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Edexcel International A Level Chemistry past papers.
The Plumi iPad app also offers exam-style questions with AI feedback on your handwritten working.