Acid–base titrations: past paper questions
Real questions on acid–base titrations
The newest 20 of 36 written questions. Open one to see it on the real paper.
- 0620/42 · February/March 2026 · Q3b(iii)[1]
Name the experimental technique used in method 2.
See it on the paper → - 0620/31 · October/November 2024 · Q8a(i)[1]
Complete Table 8.1 by writing the concentrations in the first column.
See it on the paper → - 0620/43 · May/June 2024 · Q1g[1]
determine the volume of an acid required to neutralise a given volume of an alkali. [Total: 7]
See it on the paper → - 0620/61 · May/June 2024 · Q1b[1]
Name a suitable indicator.
See it on the paper → - 0620/61 · May/June 2024 · Q1c[2]
Describe how the student can determine the volume of dilute hydrochloric acid used in this titration.
See it on the paper → - 0620/61 · May/June 2024 · Q1d[1]
State one other thing the student should do as they add the dilute hydrochloric acid to the aqueous potassium hydroxide.
See it on the paper → - 0620/62 · February/March 2024 · Q2b(i)[1]
tate which solution of dilute hydrochloric acid, A or B, is the more concentrated. S Explain your answer. more concentrated solution of dilute hydrochloric acid explanation
See it on the paper → - 0620/62 · February/March 2024 · Q2b(ii)[1]
educe how many times more concentrated this solution of dilute hydrochloric acid is than D the other solution of dilute hydrochloric acid.
See it on the paper → - 0620/62 · February/March 2024 · Q2c(i)[1]
Compare the volume of dilute hydrochloric acid A used in Experiment 1 to the volume of dilute hydrochloric acid A used in Experiment 2.
See it on the paper → - 0620/62 · February/March 2024 · Q2c(ii)[2]
educe the volume of dilute hydrochloric acid B required to reach the end-point if D Experiment 3 is repeated using thymolphthalein indicator instead of methyl orange indicator. Use your answer to (c)(i) to help you. volume of dilute hydrochloric acid B =
See it on the paper → - 0620/62 · February/March 2024 · Q2e[1]
Explain why a white tile is used during the titration.
See it on the paper → - 0620/62 · February/March 2024 · Q2f[2]
D escribe the effect on the result of warming the aqueous sodium carbonate used in Experiment 1 before carrying out the titration. Explain your answer. effect explanation [Total: 16]
See it on the paper → - 0620/63 · October/November 2023 · Q2d(iii)[2]
The conical flask is not dried after being rinsed with water. State how drying the conical flask affects the volume of aqueous sodium hydroxide needed to reach the end-point. Explain your answer.
See it on the paper → - 0620/63 · October/November 2023 · Q2e(i)[2]
Compare the volumes of aqueous sodium hydroxide needed to reach the end-point in Experiment 1 and Experiment 2.
See it on the paper → - 0620/61 · May/June 2023 · Q2a[4]
Use the burette diagrams in Fig. 2.1 and Fig. 2.2 to complete Table 2.1. Experiment 1 0 17 1 18 2 19 initial reading final reading Fig. 2.1 Experiment 2 8 20 9 21 10 22 initial reading final reading Fig. 2.2 Table 2.1 Experiment 1 using solution A Experiment 2 using solution B final burette reading / cm 3 initial bure...
See it on the paper → - 0620/62 · May/June 2022 · Q2a[3]
Use the burette diagrams to complete the table for Experiment 1.
See it on the paper → - 0620/62 · May/June 2022 · Q2b[3]
Use the burette diagrams to complete the table for Experiment 2.
See it on the paper → - 0620/62 · May/June 2022 · Q2c[1]
State the colour change observed at the end-point when dilute hydrochloric acid is added to methyl orange in an alkaline solution.
See it on the paper → - 0620/62 · May/June 2022 · Q2d[2]
For Experiment 1, compare the volume of dilute hydrochloric acid needed for the first colour change with the volume of dilute hydrochloric acid for the second colour change.
See it on the paper → - 0620/63 · May/June 2022 · Q2a[5]
Experiment 1 ● A burette was filled with dilute hydrochloric acid Q. Some of the dilute hydrochloric acid was run out of the burette so that the level of the dilute hydrochloric acid was on the burette scale. ● Using a measuring cylinder, 25 cm 3 of aqueous sodium hydroxide was poured into a conical flask. ● Five dr...
See it on the paper →
What examiners said
Comprehensive responses • Most candidates knew the technique used in Method 2. Limited responses • Some candidates thought the method was neutralisation.
— Examiner report, February/March 2026, 0620/42 Q3(b)(iii) (Cambridge)
Most candidates correctly stated that acid A was the more concentrated because it needed a smaller volume to neutralise the fixed volume of aqueous sodium carbonate. The most common error was to state acid B was the more concentrated because a larger volume was used.
— Examiner report, February/March 2024, 0620/62 Q2(b)(i) (Cambridge)
Most candidates gained the credit available. It was evident that some candidates compared Experiment 2 to Experiment 3, and so concluded acid A was 3 times more concentrated. The comparison should have been between Experiments 1 and 3; the only difference between these two experiments being the acid used. Some candidates incorrectly divided the titre from Experiment 1 by the titre from Experiment...
— Examiner report, February/March 2024, 0620/62 Q2(b)(ii) (Cambridge)
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