A conservator restores a worn pure copper medal by making it the cathode in copper(II) sulfate solution. A pure copper strip is used as the anode.
The masses before and after a direct current is passed are shown in the table.
| Electrode | Mass before electrolysis (g) | Mass after electrolysis (g) |
|---|---|---|
| pure copper strip (anode) | 22.64 | ? |
| pure copper medal (cathode) | 14.82 | 15.19 |
What is the mass of the anode after electrolysis?
21.90 g
22.27 g
23.01 g
22.64 g
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.