A student investigated the electrolysis of copper sulfate solution using copper electrodes for 15 minutes.
Their results are shown in the table below:
| Anode | Cathode | |
|---|---|---|
| Mass of electrode before electrolysis in g | 5.85 | 5.10 |
| Mass of electrode after electrolysis in g | 5.21 | 5.72 |
| Change in mass in g | −0.64 | +0.62 |
The electrolysis was repeated with a fresh cell using another pair of copper electrodes of the same starting masses.
Explain a change that could be made to the apparatus or circuit to cause the mass of the cathode to increase by 1.86 g in the same 15-minute period.
Practise Edexcel GCSE Chemistry Electrolytic processes with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.