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Electrode potentials and electrochemical cells (A-level only)

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Question 16

The theoretical EMF of a direct methanol fuel cell operating under acidic conditions is +1.21 V+1.21\text{ V}+1.21 V.

The standard electrode potential for one of the electrodes in this cell is:

CO2(g)+6H+(aq)+6e−→CH3OH(aq)+H2O(l)E⊖=+0.02 V \text{CO}_2\text{(g)} + 6\text{H}^+\text{(aq)} + 6\text{e}^- \rightarrow \text{CH}_3\text{OH(aq)} + \text{H}_2\text{O(l)} \quad E^\ominus = +0.02\text{ V} CO2​(g)+6H+(aq)+6e−→CH3​OH(aq)+H2​O(l)E⊖=+0.02 V

Give the half-equation for the other electrode and calculate its standard electrode potential.

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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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