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The production of hydrogen and oxygen by electrolysis of water

The Hoffmann apparatus is used as electrolysis cell. The two electrodes, cathode (-) and anode (+) immersed in acidified water are connected to opposite poles of a generator. - At the cathode hydrogen is produced - At the anode oxygen is produced $2H_2O$ $\longrightarrow$ $2H_2$ $+$ $O_2$ The volume of the hydrogen is twice that of the oxygen.