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Edexcel A-Level Chemistry A2 16.9 The Importance of the Conditions When Measuring an Electrode Potential E Questions

When conditions change, use equilibrium shift or the Nernst relationship to explain why electrode potential or E°cell no longer matches the Data Booklet value.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Explain how dilution or concentration changes shift half-cell equilibria and E values.
  • Use Nernst-style equations to calculate electrode potentials from ion concentrations.
  • State how current flow changes emf, electrode mass and ion concentrations over time.

Edexcel A-Level Chemistry A2 16.9 The Importance of the Conditions When Measuring an Electrode Potential E Questions question 1

[Maximum number: 2]

This question is about cell reactions involving chromium.
Use your Data Booklet when answering this question.

A student set up the following apparatus to measure the standard electrode potential for right-hand electrode system 8 in your Data Booklet.

Figure for Question Edexcel A-Level Chemistry A2 16.9 The Importance of the Conditions When Measuring an Electrode Potential E Questions question 1 — Edexcel A-Level Chemistry A2

Give two reasons why the initial reading on the voltmeter may differ from the stated value given in the Data Booklet.

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