A student electrolyses copper(II) sulfate solution using copper electrodes. The table shows the student's results.
| Electrode | Mass at start (g) | Mass at end (g) |
|---|---|---|
| anode | 20.36 | 19.94 |
| cathode | 18.65 | ? |
What is the mass of the cathode at the end?
18.23 g
18.65 g
19.07 g
19.49 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.