plumipH and strong acids: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 14.1.2 pH and strong acids, 2019–2025, with mark schemes and examiner’s reports where available.
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All 12 questions on pH and strong acids, as a list
- June 2025, Unit 4, Q4 (1 mark): What is the pH of a 1.25 mol dm–3 solution of hydrochloric acid? A −1.25 B −0.097 C 0.097 D 1.25
- January 2025, Unit 4, Q4 (1 mark): A strong monoprotic acid, of concentration 0.0100 mol dm–3, has a pH = 2.0. What is the decrease in pH if the concentration is increased to 0.0110 mol dm–3? A 0
- October 2024, Unit 4, Q17(b)(i) (1 mark): State what is meant by the term weak in this context. (1)
- January 2024, Unit 4, Q19(b)(i) (1 mark): State the difference between a weak acid and a strong acid such as hydrochloric acid. (1)
- January 2024, Unit 4, Q19(b)(ii) (1 mark): Calculate the pH of 0.500 mol dm–3 hydrochloric acid at 25 °C. (1)
- January 2023, Unit 4, Q11 (1 mark): A 1 mol dm–3 solution of ethanoic acid is gradually diluted by the addition of distilled water. What happens to the degree of dissociation of the acid and the p
- January 2022, Unit 4, Q12(b) (1 mark): The rate equation for the reaction between propanone and iodine in acidic conditions is rate = k[H+][CH3COCH3] The reaction was carried out at two different pH
- October 2021, Unit 4, Q20(b)(iii) (4 marks): Separate samples of 0.00500 mol of hydrochloric acid are added to 1.00 dm3 of distilled water and to the buffer in (b)(ii). Calculate the pH changes that result
- January 2021, Unit 4, Q18(b)(ii) (1 mark): The pH of a 0.10 mol dm−3 solution of sulfuric acid at 25 °C is 0.97. Calculate the concentration of hydrogen ions, in mol dm−3, in this solution. (1)
- October 2020, Unit 4, Q18(a)(i) (2 marks): A solution of hydrochloric acid has a pH of 1.125. Calculate the concentration of hydrogen ions and of hydroxide ions, in mol dm−3, in this solution. [Kw = 1.00
- October 2020, Unit 4, Q18(a)(ii) (4 marks): Calculate the volume of water which must be added to 25.0 cm3 of this solution to increase the pH from 1.125 to 1.500, giving your answer to an appropriate numb
- January 2020, Unit 4, Q10 (1 mark): How are 20 cm3 of 0.05 mol dm–3 H2SO4(aq) and 20 cm3 of 0.10 mol dm–3 CH3COOH(aq) alike? Both solutions A have the same pH B have the same total concentration o
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