Essential Chemistry for IGCSE - Electricity And Chemistry (Section 8 - No. 45)
What is the role of the sodium hydroxide in the purification of bauxite ore?
To act as a reducing agent.
To dissolve the aluminum oxide.
To remove the iron oxides.
To lower the melting point of the ore.
Explanation
Sodium hydroxide dissolves the aluminum oxide, forming sodium aluminate.
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