plumiDefinition and determination of pH: AQA A‑Level Chemistry questions
AQA A-Level Chemistry past-paper questions on 3.1.12.2 Definition and determination of pH, 2008–2025, with mark schemes and examiner’s reports where available.
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Q08.1
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All 36 questions on Definition and determination of pH, as a list
- June 2025, Paper 1, Q08.1 (2 marks): Nitric acid is a strong acid. Calculate the pH of 0.150 mol dm–3 nitric acid. Give your answer to 2 decimal places. [2 marks] pH
- June 2022, Paper 3, Q14 (1 mark): A strong acid H2X dissociates in aqueous solution. H2X(aq) → 2 H+(aq) + X2– (aq) What is the pH of a 0.020 mol dm–3 solution of this acid? [1 mark] A 1.00 B 1.4
- November 2021, Paper 1, Q06.3 (4 marks): Give the expression for pH. Calculate the pH of pure water at 50 °C Give your answer to 2 decimal places. Explain why water is neutral at 50 °C [4 marks] Expres
- November 2021, Paper 1, Q06.4 (1 mark): Use Figure 3 to give the true pH value when the pH meter reading is 5.6 [1 mark]
- November 2021, Paper 1, Q06.5 (1 mark): Suggest why the pH probe is washed with distilled water between each of the calibration measurements. [1 mark]
- November 2021, Paper 1, Q06.8 (5 marks): 36.25 cm3 of 0.200 mol dm–3 sodium hydroxide solution are added to 25.00 cm3 of 0.150 mol dm–3 hydrochloric acid. Calculate the pH of the final solution at 25 º
- November 2020, Paper 1, Q04.3 (4 marks): A student dilutes 25.0 cm3 of 0.500 mol dm–3 propanoic acid by adding water until the total volume is 100.0 cm3 Calculate the pH of this diluted solution of pro
- November 2020, Paper 3, Q13 (1 mark): Which statement about pH is correct? [1 mark] A The pH of a weak base is independent of temperature. B At temperatures above 298 K, the pH of pure water is less
- November 2020, Paper 3, Q32 (1 mark): Which is the concentration of NaOH(aq), in mol dm–3, that has pH = 14.30? Kw = 1.00 × 10–14 mol2 dm–6 at 25 °C [1 mark] A –1.16 B 5.01 × 10–15 C 2.00 × 1014 D 2
- November 2020, Paper 3, Q34 (1 mark): What is the pH of 0.015 mol dm–3 sulfuric acid? [1 mark] A –1.82 B –1.52 C 1.52 D 1.82
- June 2019, Paper 1, Q09.1 (4 marks): For pure water at 40 °C, pH = 6.67 A student thought that the water was acidic. Explain why the student was incorrect. Determine the value of Kw at this tempera
- June 2019, Paper 1, Q09.2 (3 marks): Sodium hydroxide solution was added gradually from a burette to 25 cm3 of 0.080 mol dm–3 propanoic acid at 25 °C The pH was measured and recorded at regular int
- June 2018, Paper 1, Q05.2 (6 marks): In an experiment, 10.35 cm3 of 0.100 mol dm–3 hydrochloric acid are added to 25.0 cm3 of 0.150 mol dm–3 barium hydroxide solution. Calculate the pH of the solut
- June 2017, Paper 1, Q03.2 (2 marks): Calculate the pH of pure water at 10 °C Give your answer to two decimal places. [2 marks pH of water
- June 2017, Paper 1, Q03.4 (3 marks): Calculate the pH of a 0.0131 mol dm−3 solution of calcium hydroxide at 10 °C Give your answer to two decimal places. [3 marks] pH of solution
- June 2017, Paper 1, Q03.5 (2 marks): The 0.0131 mol dm−3 calcium hydroxide solution at 10 °C was a saturated solution. A student added 0.0131 mol of magnesium hydroxide to 1.00 dm3 of water at 10 °
- June 2017, Paper 3, Q27 (1 mark): The rate equation for the acid-catalysed reaction between iodine and propanone is: rate = k [H+] [C3H6O] The rate of reaction was measured for a mixture of iodi
- Specimen, Paper 3, Q13 (1 mark): What is the pH of a 0.020 mol dm–3 solution of a diprotic acid which is completely dissociated? [1 mark] A 1.00 B 1.40 C 1.70 D 4.00 1 3
- June 2016, CHEM4 (old spec), Q1(c)(i) (2 marks): Calculate the pH of the solution formed after 50.0 cm3 of distilled water are added to beaker A. Give your answer to 2 decimal places. [2 marks] 3 3
- June 2016, CHEM4 (old spec), Q1(c)(ii) (4 marks): Calculate the pH of the solution formed after 50.0 cm3 of 0.0108 mol dm−3 aqueous sodium hydroxide are added to beaker B. Give your answer to 2 decimal places.
- June 2014, CHEM4 (old spec), Q2(e) (3 marks): Two solutions, one with a pH of 4.00 and the other with a pH of 9.00, were left open to the air. The pH of the pH 9.00 solution changed more than that of the ot
- June 2013, CHEM4 (old spec), Q3(e) (6 marks): Using a burette, 26.40 cm3 of 0.550 mol dm–3 sulfuric acid were added to a conical flask containing 19.60 cm3 of 0.720 mol dm–3 aqueous sodium hydroxide. Assume
- June 2012, CHEM4 (old spec), Q3(c) (3 marks): A 25.0 cm3 sample of 0.0850 mol dm–3 hydrochloric acid was placed in a beaker. Distilled water was added until the pH of the solution was 1.25 Calculate the tot
- January 2012, CHEM4 (old spec), Q4(a) (2 marks): A 25.0 cm3 sample of 0.0850 mol dm–3 hydrochloric acid was placed in a beaker and 100 cm3 of distilled water were added. Calculate the pH of the new solution fo
- January 2012, CHEM4 (old spec), Q4(c) (6 marks): A 25.0 cm3 sample of 0.620 mol dm–3 nitric acid was placed in a beaker and 38.2 cm3 of 0.550 mol dm–3 aqueous sodium hydroxide were added. Calculate the pH of t
- June 2011, CHEM4 (old spec), Q2(a)(i) (1 mark): Write an expression for pH. (1 mark)
- June 2011, CHEM4 (old spec), Q2(c)(ii) (4 marks): Calculate the pH of the solution formed when 40.0 cm3 of 0.154 mol dm–3 potassium hydroxide are added to 20.0 cm3 of 0.154 mol dm–3 ethanoic acid at 25 °C. At 2
- January 2011, CHEM4 (old spec), Q2(a)(i) (1 mark): Write an expression for pH. (1 mark) 3
- January 2011, CHEM4 (old spec), Q2(a)(ii) (1 mark): Calculate the pH of 0.154 mol dm–3 hydrochloric acid. (1 mark) 3 3
- January 2011, CHEM4 (old spec), Q2(a)(iii) (2 marks): Calculate the pH of the solution formed when 10.0 cm3 of 0.154 mol dm–3 hydrochloric acid are added to 990 cm3 of water.
- June 2010, CHEM4 (old spec), Q5(a)(i) (1 mark): Write an expression for pH. (1 mark)
- June 2010, CHEM4 (old spec), Q5(c) (6 marks): Calculate the pH of the solution formed when 25.0cm3 of 0.150moldm–3 aqueous sulfuric acid are added to 30.0cm3 of 0.200moldm–3 aqueous potassium hydroxide at 2
- January 2010, CHEM4 (old spec), Q2(a)(i) (1 mark): Write an expression for the term pH. (1 mark) 3
- January 2010, CHEM4 (old spec), Q2(a)(ii) (2 marks): Calculate the concentration, in mol dm–3, of an aqueous solution of sulfuric acid that has a pH of 0.25
- June 2008, CHM4 (2008 spec), Q1(a) (1 mark): 1 (a) Calculate the pH of 0.0380 mol dm–3 hydrochloric acid. (1 mark)
- June 2008, CHM4 (2008 spec), Q1(b) (2 marks): 1 (b) Calculate the pH of the solution formed when 100 cm3 of pure water are added to 100 cm3 of this 0.0380 mol dm–3 hydrochloric acid. (2 marks)
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