plumiBuffer action and Ka from titration curves: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 14.3.3 Buffer action and Ka from titration curves, 2019–2025, with mark schemes and examiner’s reports where available.
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Q20(d)(iii)
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Open the full PDFQ19(c)(i)
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Open the full PDFQ18(a)(v)
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Open the full PDFQ22(d)(i)
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Open the full PDFQ19(a)(iii)
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Open the full PDFQ10(a)
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Open the full PDFYour answer
All 6 questions on Buffer action and Ka from titration curves, as a list
- January 2025, Unit 4, Q20(d)(iii) (5 marks): Determine, by using the graph, the two Ka values for oxalic acid. You must show your working on the graph. (5)
- January 2024, Unit 4, Q19(c)(i) (2 marks): Calculate the pH at the point in the titration where half the acid has been neutralised. You must show your working. (2)
- October 2023, Unit 4, Q18(a)(v) (2 marks): The student deduced that at Key point 2, 15.0 cm3 of potassium hydroxide would have been added and the pH would be 4.9. Justify the student’s deductions using a
- June 2023, Unit 4, Q22(d)(i) (2 marks): Explain how this graph shows Tris and its conjugate acid act as a buffer. (2)
- June 2022, Unit 4, Q19(a)(iii) (3 marks): Use the titration curve to determine a value for the acid dissociation constant, Ka , of methanoic acid. (3)
- January 2021, Unit 4, Q10(a) (1 mark): Which region of the graph represents the most effective buffer solution? (1) A region T B region U C region V D region W
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