Edexcel A-Level Chemistry A2 16.5 Different Methods Are Used to Measure Standard Electrode Potentials of I Metals or Non Metals in Contact with Their Ions Questions

Practise Edexcel IAL Chemistry 16.5 by choosing metal or platinum electrodes for each half-cell and selecting suitable soluble ionic electrolytes from complete exam evidence.

Exam points

Choose metal electrodes for metal half-cells and platinum for ion-only systems.
Identify suitable soluble ionic compounds as electrolytes for an ion half-cell.

[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 16.5 Different Methods Are Used to Measure Standard Electrode Potentials of I Metals or Non Metals in Contact with Their Ions Questions question 1 — Edexcel A-Level Chemistry A2

Identify X and Y.

X:

Y:

platinum / Pt

- $1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{Cr}^{2+}$ and

$1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{Cr}^{3+}$

Accept platinised platinum / platinum black

Allow $1 \mathrm{~mol} \mathrm{dm}^{-3}$ named soluble chromium(II) salts

Allow named soluble chromium(III) salts giving $1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{Cr}^{3+}$ solution

Allow $1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{Cr}^{2+}$ and $\mathrm{Cr}^{3+}$

Ignore equimolar

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Edexcel A-Level Chemistry A2 16.5 Different Methods Are Used to Measure Standard Electrode Potentials of I Metals or Non Metals in Contact with Their Ions Questions question 1