(c) Aqueous copper(II) sulphate can be electrolysed using copper electrodes. The reaction at the negative electrode is the same but the positive electrode becomes
smaller and the solution remains blue.
(i) Write a word equation for the reaction at the positive electrode.
[1]
(II) Explain why the colour of the solution does not change.
[2]
(iii) What is the large scale use of this electrolysis?[1]