Electrolysis

Pure water does not conduct electricity. But when small amount of acid say is added to it, water ionises. On passing electricity, it decomposes. being a strong electrolyte ionise completely whereas water is feebly ionised During electrolysis, the hydrogen ions migrate towards the cathode and discharge here in the form of hydrogen gas At anode, the concentration of ions is too low to maintain a reaction and sulphate ions are not oxidised but remain in solution. Thus water molecules must be the species reacting at anode The overall reactions are : At cathode At anode Overall cell reaction : as we see that acid used is regenerated at the end. Therefore, the whole electrolysis reaction is the dissociation of water to give oxygen at anode and hydrogen at cathode catalysed by .

Given, of solution. It means that of solution contains of solution contains of is deposited by of is deposited by or

Given of solution. It means that of solution contains of solution contains of Ag is deposited by of is deposited by