Essential Chemistry for IGCSE - Electricity And Chemistry (Section 8 - No. 6)
What is the reason that the carbon anodes in the electrolysis cell are continually replaced?
To maintain the correct concentration of cryolite.
To prevent the build-up of aluminum oxide.
To replace the carbon consumed during the reaction with oxygen.
To remove impurities from the electrolyte.
Explanation
The anodes react with oxygen, forming carbon dioxide, and gradually burn away.
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