Why is the electrolysis of acidified water carried out rather than pure water?

Why is copper refined electrolytically rather than chemically?

During the electrolysis of aqueous copper sulphate using copper electrodes, state what happens at each electrode and why the colour of the solution does not change.

What is meant by the electrochemical series, and how does it decide which ion is discharged at the cathode?

Write the reactions at the cathode and at the anode during the electrolysis of molten lead bromide, and name the products.

Describe the electroplating of an article with silver, naming the electrodes and the electrolyte.

Name the products at each electrode during the electrolysis of acidified water with platinum electrodes.