Essential Chemistry for IGCSE - Electricity And Chemistry (Section 8 - No. 12)
Why is the electrolysis of aluminum oxide carried out at a temperature of around 900°C instead of 2040°C?
To allow for a higher yield of aluminum.
To prevent the formation of carbon dioxide.
To reduce energy consumption.
To improve the purity of the aluminum.
Explanation
Dissolving aluminum oxide in cryolite lowers the melting point, thus reducing the energy needed.
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