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1 markElectrochemistry

CSEC Chemistry · May/June 2013 · Paper 2 · Question 5(b)(i)

An experiment was carried out to purify copper by electrolyzing copper(II) sulfate solution using impure copper as the anode and a pure copper cathode.

State what is expected to happen to the anode during the experiment.

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Other parts of this question

  1. 5(a)(i)the name of the electrolyte and ions present[2 marks]
  2. 5(a)(ii)an explanation for which ions are preferentially discharged at the electrodes[2 marks]
  3. 5(a)(iii)ionic equations showing the reactions at EACH electrode[4 marks]
  4. 5(a)(iv)the role of the ion exchange membrane in the diagram.[1 mark]
  5. 5(b)(ii)Calculate the mass of pure copper that would be produced during the experiment if a current of 5 A flowed for 30 minutes. (Molar mass of Cu: 64 g mol⁻¹)[5 marks]

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