plumiTitration curves: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 14.2.1 Titration curves, 2019–2025, with mark schemes and examiner’s reports where available.
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Q12(a)
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All 22 questions on Titration curves, as a list
- June 2025, Unit 4, Q12(a) (1 mark): Which curve is produced by adding ammonia to 25 cm3 of hydrochloric acid? (1) A Curve 1 B Curve 2 C Curve 3 D Curve 4
- January 2025, Unit 4, Q20(d)(i) (2 marks): A student sketched a curve to show the changing pH during the titration. 14 13 12 11 10 9 8 pH 7 6 5 4 3 2 1 0 10 20 30 40 50 60 Volume of NaOH(aq) added / cm3
- October 2024, Unit 4, Q4 (1 mark): A titration curve for the titration of an acid with a strong base is shown. pH Volume of base What could be the formula of the acid? A HX B HX2 C H2X D H3X
- June 2024, Unit 4, Q19(b) (3 marks): 4‑Hydroxybenzoic acid, HOC6H4COOH, is a diprotic acid, which dissociates in two stages. Each stage has a different pKa value. Stage 1 HOC6H4COOH H+ + HOC6H4CO
- January 2024, Unit 4, Q19(c)(ii) (3 marks): Sketch the titration curve showing the change in pH when 50 cm3 of 0.500 mol dm–3 sodium hydroxide is added to 25.0 cm3 of propanoic acid of the same concentrat
- October 2023, Unit 4, Q18(a)(ii) (2 marks): The student deduced that the pH at Key point 4 must be less than 13. Use a calculation to justify the student’s deduction. You are not required to calculate the
- October 2023, Unit 4, Q18(a)(iii) (2 marks): The student deduced that the neutralisation point of the graph at Key point 3 would be at 30 cm3. Use a calculation to justify the student’s deduction. (2)
- October 2023, Unit 4, Q18(a)(iv) (1 mark): The student deduced that when equal amounts of pentanoic acid and potassium hydroxide have been mixed at Key point 3, the pH would be greater than 7. Justify th
- October 2023, Unit 4, Q18(b) (3 marks): The student then completed the sketch graph by linking these four points to show how the pH would change as potassium hydroxide was added. 14 13 12 Key point 4
- June 2023, Unit 4, Q13(b) (1 mark): Which acid and base could produce this curve? (1) A CH3COOH and NaOH B CH3COOH and NH3 C HCl and NaOH D HCl and NH3
- June 2023, Unit 4, Q14(a) (1 mark): Which could be the titration curve when sodium hydroxide is added to maleic acid? (1) 14 12 10 8 pH 6 A 4 2 0 0 20 40 60 80 Volume of NaOH / cm3 14 12 10 8 pH 6
- June 2023, Unit 4, Q22(d)(ii) (1 mark): Use the graph to estimate the pH of the salt formed when Tris is neutralised with chloroethanoic acid. (1)
- January 2023, Unit 4, Q21(b)(ii) (5 marks): Calculate the pH of the titration mixture after the addition of 35.0 cm3 of sodium hydroxide solution. The value required cannot be obtained from the titration
- June 2022, Unit 4, Q9(a) (1 mark): Which titration would produce this curve? (1) A ethanoic acid added to sodium hydroxide B hydrochloric acid added to sodium hydroxide C ethanoic acid added to a
- June 2022, Unit 4, Q19(a)(i) (1 mark): Complete the equation for the reaction taking place in this titration. State symbols are not required. (1) HCOOH +
- June 2022, Unit 4, Q19(a)(ii) (2 marks): Calculate the concentration of the potassium hydroxide solution, using your equation in (i) and the titration curve. (2)
- June 2021, Unit 4, Q4(a) (1 mark): Which acidic solution was used in the titration? (1) A 0.1 mol dm–3 CH3COOH B 1.0 mol dm–3 CH3COOH C 0.1 mol dm–3 HCl D 1.0 mol dm–3 HCl
- June 2021, Unit 4, Q4(b) (1 mark): Which basic solution was used in the titration? (1) A NH3 B LiOH C Ba(OH)2 D NaOH
- January 2021, Unit 4, Q10(c) (1 mark): What is the approximate pH of an ammonium chloride solution? (1) A 2.0 B 5.8 C 9.7 D 11.3
- October 2020, Unit 4, Q9(a) (1 mark): Which graph has ethanoic acid as one of the reactants? (1) A Graph 1 B Graph 2 C Graph 3 D Graph 4
- October 2020, Unit 4, Q9(b) (1 mark): Which graph shows a solution that has an acidic pH at the end-point? (1) A Graph 1 B Graph 2 C Graph 3 D Graph 4
- January 2020, Unit 4, Q11 (1 mark): Which two solutions, both of concentration 0.10 mol dm–3, have been used to produce this titration curve? 14 pH 7 0 Volume of alkali added A HCl(aq) and KOH(aq)
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