plumiChoosing an indicator: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 14.2.2 Choosing an indicator, 2019–2025, with mark schemes and examiner’s reports where available.
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Q12(b)
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All 20 questions on Choosing an indicator, as a list
- June 2025, Unit 4, Q12(b) (1 mark): Which of these indicators would be most suitable to determine the end-point for the titration that gives Curve 4? (1) Indicator pH range A congo red 3.0–5.0 B b
- June 2025, Unit 4, Q17(d) (3 marks): A type of bubble bath contains a weak acid and the indicator bromocresol green. The bubble bath is initially yellow but when diluted with bath water, its colour
- June 2025, Unit 6, Q2(b) (2 marks): Give the name of a suitable indicator to use in Step 4, including the expected colour change at the end-point. (2) Name of indicator Colour change from to
- 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
- January 2025, Unit 4, Q20(d)(ii) (1 mark): Suggest a difficulty that would occur if both indicators were present in the same mixture. (1)
- October 2024, Unit 4, Q6 (1 mark): Which indicator can be used to show the end‑point of a titration between hydrochloric acid, HCl(aq), and ammonia solution, NH3(aq)? A universal indicator B phen
- October 2024, Unit 4, Q7 (1 mark): Phenolphthalein is a very weak acid and it forms a colourless solution under acidic conditions. Sodium hydroxide is titrated against hydrochloric acid using phe
- January 2024, Unit 4, Q19(c)(iii) (2 marks): Suggest a suitable indicator for this titration. Justify your choice by referring to your titration curve in (c)(ii). Use the Data Booklet. (2)
- October 2023, Unit 4, Q18(c)(i) (3 marks): The student carried out the titration using methyl orange as an indicator. The experiment did not give a satisfactory colour change at the neutralisation point,
- October 2023, Unit 4, Q18(c)(ii) (2 marks): The student found a bottle labelled ‘Acid‑base indicator solution’ in the store cupboard. The student, having checked with the teacher, used this as the indicat
- June 2023, Unit 4, Q13(a) (1 mark): Which indicators could be used for this titration? Use your Data Booklet. (1) A bromocresol green, methyl red and phenolphthalein B bromothymol blue, phenol red
- January 2023, Unit 4, Q21(b)(i) (2 marks): Explain why phenol red is an appropriate indicator for this titration. Refer to the titration curve and the Data Booklet. (2)
- October 2022, Unit 4, Q10 (1 mark): Which of these indicators is most suitable for the titration of ammonia solution with hydrochloric acid? A methyl violet (pKin = 0.8) B bromocresol green (pKin
- June 2022, Unit 4, Q9(b) (1 mark): Which indicator would be most suitable for this titration? (1) Indicator pH range A malachite green 0.2–1.8 B methyl yellow 2.9–4.0 C methyl red 4.2–6.3 D thymo
- January 2022, Unit 4, Q5 (1 mark): An example of a diprotic acid is cis‑butenedioic acid. Titration of this acid using sodium hydroxide solution gave the titration curve shown. 14 12 10 8 pH 6 4
- October 2021, Unit 4, Q20(c) (3 marks): The titration curve obtained from the addition of sodium hydroxide solution to a weak acid is shown. The equivalence point (E) of this titration occurred at pH
- June 2021, Unit 4, Q4(c) (1 mark): A student suggested five indicators that might be used in this titration: thymol blue methyl orange bromophenol blue bromocresol green phenolphthalein How many
- January 2021, Unit 4, Q10(b) (1 mark): Which of these is the best indicator to use in this titration? [Refer to the Data Booklet] (1) A methyl red B phenol red C phenolphthalein D thymol blue
- October 2020, Unit 4, Q9(c) (1 mark): Which indicator is suitable for the titration shown in Graph 3? Use your Data Booklet. (1) A bromocresol green B bromothymol blue C phenol red D thymol blue (ac
- January 2020, Unit 4, Q20(a)(iv) (2 marks): Two indicators, methyl orange and phenolphthalein, were available for this titration. Student A thought only methyl orange could be used. Student B thought only
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