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Electrode potentials and electrochemical cells (A-level only)

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Question 2

Some standard electrode potential data are shown:

Co2+(aq)+2e−→Co(s)E⊖=−0.28 VCu2+(aq)+2e−→Cu(s)E⊖=+0.34 V \begin{aligned} \text{Co}^{2+}(\text{aq}) + 2\text{e}^- &\rightarrow \text{Co}(\text{s}) \quad E^\ominus = -0.28\text{ V} \\ \text{Cu}^{2+}(\text{aq}) + 2\text{e}^- &\rightarrow \text{Cu}(\text{s}) \quad E^\ominus = +0.34\text{ V} \end{aligned} Co2+(aq)+2e−Cu2+(aq)+2e−​→Co(s)E⊖=−0.28 V→Cu(s)E⊖=+0.34 V​

Which is a correct statement about this cell?

Co(s)∣Co2+(aq)∥Cu2+(aq)∣Cu(s) \text{Co}(\text{s}) \mid \text{Co}^{2+}(\text{aq}) \parallel \text{Cu}^{2+}(\text{aq}) \mid \text{Cu}(\text{s}) Co(s)∣Co2+(aq)∥Cu2+(aq)∣Cu(s)
A

The standard EMF of the cell is +0.06 V+0.06\text{ V}+0.06 V.

B

Electrons flow in the external circuit from the copper electrode to the cobalt electrode.

C

The concentration of cobalt(II) ions decreases as the cell discharges.

D

The mass of the copper electrode increases during the operation of the cell.

Markscheme

Electrode potentials and electrochemical cells (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Electrode potentials and electrochemical cells (A-level only)

34 exam-style questions on AQA A Level Chemistry Electrode potentials and electrochemical cells (A-level only), covering Electrode potentials and cells (A-level only) and Commercial applications of electrochemical cells (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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