A student investigated the electrolysis of copper(II) sulfate solution using copper electrodes. They measured the mass lost by the anode and the mass gained by the cathode over a period of 10 minutes.
Their results are shown in the table below.
| Time (minutes) | Decrease in mass of anode (g\text{g}g) | Increase in mass of cathode (g\text{g}g) |
|---|---|---|
| 0 | 0.00 | 0.00 |
| 2 | 0.15 | 0.15 |
| 4 | 0.30 | 0.30 |
| 6 | 0.45 | 0.45 |
| 8 | 0.60 | 0.60 |
| 10 | 0.75 | 0.75 |
Describe, using the data in the table, what the results show about the mass changes of the anode and cathode during this experiment.
83 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.