Chemistry Form 4?

Question

1.(a)Lime juice was electrolysed using carbon electrodes.
What is produced at the cathode?Write a half equation for
the reaction.

(b)A student intends to electroplate an iron key with a suitable metal to beautify it.Design a laboratory experiment to electroplate the iron key.Your answer should consist of the following:
(i)Chemicals required
(ii)Procedures of the experiment
(iii)Diagram showing the set -up of apparatus
(iv)Chemical equation involved in the reaction
(v)Observation

Answer 1

Hydrogen would be produced at the cathode:

2H+ + 2e- ----> H2

You should make the iron nail the cathode, and a piece of copper the anode. The electrolyte should be copper sulphate solution. A clean iron nail will end up copper plated this way.