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ZIMSEC A-Level Chemistry

6.1.7.6Choice of indicators and titration curves

Choice of indicators and titration curves in ZIMSEC A-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 6.1.7.6.1Explain the choice of a suitable indicator for an acid-base titration from given data.
  2. 6.1.7.6.2Describe graphically the changes in pH during acid-base titrations.

Lessons

  • pH titration curves and indicators

    45 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Choice of indicators and titration curves: sample question

1 mark

Aqueous ammonia is titrated with hydrochloric acid. Data (pH ranges): methyl orange 2.9–4.6; bromophenol blue 3.0–4.5; phenolphthalein 8.3–10.0; thymolphthalein 9.3–10.5. Which indicator is most suitable?

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