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Edexcel A-Level Chemistry A2 14.16 Select a Suitable Indicator for a Titration Questions

Compare the indicator range or pKind with the steep part of the titration curve, then justify the colour change and reject ranges outside the endpoint.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Choose an indicator whose pH range lies within the curve's vertical section.
  • Justify the choice with Data Booklet pH ranges, pKind values or endpoint colours.
  • Explain why mixed indicators can obscure the endpoint when colours overlap.

Edexcel A-Level Chemistry A2 14.16 Select a Suitable Indicator for a Titration Questions question 1

[Maximum number: 2]

The number of moles of propanoic acid in a solution may be determined by titration with aqueous sodium hydroxide.

Suggest a suitable indicator for this titration. Justify your choice by referring to your titration curve in (c)(ii).
Use the Data Booklet.

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