Essential Chemistry for IGCSE - Electricity And Chemistry (Section 2 - No. 18)
In the process of extracting aluminum, what is the purpose of heating bauxite with sodium hydroxide?
To reduce the melting point of the ore.
To convert aluminum oxide to sodium aluminate.
To remove impurities from the ore.
To act as a catalyst in the reaction.
Explanation
The sodium hydroxide reacts with the aluminium oxide in the bauxite to form sodium aluminate, which dissolves.
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