A student investigated the electrolysis of nickel sulfate solution using a pure nickel cathode and an impure nickel anode.
The table below shows the measurements and observations from the experiment:
| Mass of cathode in g | Colour of nickel sulfate solution | |
|---|---|---|
| Before electrolysis | 4.15 | green solution |
| After electrolysis | 4.68 | green solution |
Explain why the green colour of the nickel sulfate solution did not change during the electrolysis.
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.