A technician uses electrolysis to add copper to a pure copper printing plate. The printing plate is the cathode and a pure copper strip is the anode. Both are placed in copper(II) sulfate solution.
| Electrode | Mass before (g) | Mass after (g) |
|---|---|---|
| pure copper strip (anode) | 84.75 | 83.92 |
| printing plate (cathode) | 126.40 | 127.08 |
Calculate the mass of copper that is missing from the printing plate at the end of the electrolysis.
Suggest one reason for the missing copper you calculated in (a).
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.