plumiWhat buffers are and how they work: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 14.3.1 What buffers are and how they work, 2019–2025, with mark schemes and examiner’s reports where available.
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Q17(b)(ii)
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All 9 questions on What buffers are and how they work, as a list
- October 2024, Unit 4, Q17(b)(ii) (2 marks): State what is meant by the term buffer solution. (2)
- June 2023, Unit 4, Q22(b)(i) (3 marks): Explain how a mixture of Tris and its conjugate acid acts as a buffer solution when a small amount of acid is added. (3)
- January 2023, Unit 4, Q21(c)(i) (4 marks): Explain how a solution that contains both gluconic acid and sodium gluconate acts as a buffer. Use RCOOH for the formula of gluconic acid. (4)
- January 2022, Unit 4, Q22(e)(iii) (3 marks): A solution containing both ammonia and ammonium ions acts as a buffer. Explain, using a relevant ionic equation, the effect of adding a small amount of acid to
- October 2021, Unit 4, Q20(b)(i) (2 marks): State what is meant by the term buffer. (2)
- June 2021, Unit 4, Q19(c)(i) (3 marks): Use the equilibria to explain how the buffer keeps the pH of blood nearly constant when a small increase in the concentration of hydrogen ions occurs. (3)
- January 2021, Unit 4, Q18(c)(i) (2 marks): Write two ionic equations involving HSO4 solution acts as a buffer. State symbols are not required. (2)
- October 2020, Unit 4, Q18(d) (3 marks): Phosphate buffer solutions containing hydrogenphosphate ions, HPO2− 4 , and − , are commonly used in biological research. dihydrogenphosphate ions, H2PO4 Explai
- January 2020, Unit 4, Q20(b)(ii) (5 marks): Small amounts of sodium hydroxide and hydrochloric acid are added to separate samples of the buffer solution in (b)(i). Explain why these samples resist change
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