plumiHow buffer solutions work: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.1.3.4 How buffer solutions work, 2016–2025, with mark schemes and examiner’s reports where available.
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Open the full PDFYour answerQ20(f)
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Open the full PDFQ19(b)(i)
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All 5 questions on How buffer solutions work, as a list
- June 2024, Paper 1, Q12 (1 mark): Which solution can be added to CH3COOH(aq) to make a buffer solution? A CH3COONa(aq) B HCOOH(aq) C HCl (aq) D NaCl (aq) Your answer [1]
- June 2023, Paper 1, Q20(f) (1 mark): A buffer solution has a pH of 4.50. When a small volume of water is added to this buffer solution, the pH does not change. Explain why the pH does not change. [
- June 2022, Paper 1, Q19(b)(i) (1 mark): Explain why a buffer solution is formed. [1]
- June 2022, Paper 1, Q19(b)(iii) (2 marks): A small amount of aqueous ammonia, NH3(aq), is added to the buffer solution. Explain, in terms of equilibrium, how the buffer solution would respond to the adde
- June 2019, Paper 1, Q17(a) (6 marks): Healthy human blood needs to be maintained at a pH of 7.40 for the body to function normally. −, (a)* Carbonic acid, H2CO3, is a weak acid which, together with
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