Essential Chemistry for IGCSE - Electricity And Chemistry (Section 4 - No. 32)
In the electrolysis of molten aluminum oxide, what is the role of the carbon anodes?
To provide the source of oxygen.
To act as a cathode for the reduction of aluminum ions.
To prevent the formation of aluminum.
To react with the oxygen produced, forming carbon dioxide.
Explanation
The carbon anodes react with the oxygen produced during electrolysis, forming carbon dioxide gas. This is why the anodes have to be replaced.
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