e Electrolysis of solutions of ionic salts Most ionic salts can be used satisfactorily in electrolysis Concentrations of 1M or less are suitable Potassium iodide gives iodine at the anode and hydrogen gas at the cathode Zinc sulphate gives a spongy mass of zinc at the cathode oxygen gas at the anode Lead acetate deposits lead on the cathode and oxygen gas is produced at the anode If the lead acetate solution is cloudy add a few drops of acetic acid Sodium chloride gives hydrogen gas at the cathode and chlorine gas at the anode Copper sulphate deposits copper at the cathode and oxygen gas is produced at the anode