Before performing an electrolysis experiment using copper electrodes and copper(II) sulfate solution, a student measured the initial mass of each electrode. After the electrolysis was complete, the electrodes were rinsed, dried, and weighed again.
The table below shows the results of this experiment.
| Electrode | Mass of electrode before electrolysis in g | Mass of electrode after electrolysis in g | Change in mass of electrode in g |
|---|---|---|---|
| Anode | 15.45 | 14.82 | −0.63 |
| Cathode | 14.18 | 14.81 | +0.63 |
Explain these results.
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.