Question

State the electrode reaction at the cathode and anode during electrolysis of:
1. Acidified water.
2. Copper (II) sulphate using copper electrodes.
3. Fused lead bromide.
Using a copper anode, the blue colour of the copper sulphate solution does not
disappear during its electrolysis. Give Reasons.
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Answer 1

Explanation:

1) Electrolysis of acidified water

If water is acidified with a little dilute sulfuric acid: H + ions are attracted to the cathode , gain electrons and form hydrogen gas. OH - ions are attracted to the anode , lose electrons and form oxygen gas.

2)Electrolysis of Copper Sulfate. ... On reaching on the cathode, each Cu+ + ion will take electrons from it and becomes neutral copper atoms. Similarly the SO4 − − (anion) ions will be attracted by anode i.e. the electrode connected to the positive terminal of the battery.