Electrolytic Reduction Of Alumina To Aluminium By Hall-Heroult Process Is Carried Out

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Question

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out

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Solution

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In the presence of cryolite which forms a melt with lower melting point

In the extraction of Al, Al₂O₃ is melted with cryolite [Na₃(AlF₆)]. Cryolite improves the electrical conductivity of the alumina and lowers the m.p. of the mixture to about 950^oC.