Essential Chemistry for IGCSE - Electricity And Chemistry (Section 7 - No. 50)
In the extraction of aluminum, what is the main reason why it is important to replace the carbon anodes periodically?
To prevent the formation of aluminum.
To replenish the supply of carbon in the electrolyte.
Because they are 'burned away' by reacting with the oxygen produced.
Because they get coated with aluminum metal.
Explanation
The carbon anodes react with the oxygen produced during electrolysis, gradually consuming the carbon.
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