Question

Why are two anodes used instead of one?​

Answer 1

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The reason is that when the space charge on the cathode is neutral the charge is static, thus placing an anode with a much higher volview.

■》During the electrolysis process, aluminium is deposited at the cathode and oxygen is liberated at the anode. Some of this oxygen reacts with the carbon in the graphite to form carbon-dioxide, thus slowly burning away the anodes. Thus, the anodes have to replaced periodically.