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Question

What is the function cryolite in the extraction of Al, other than dissolving bauxite.


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Solution

Function of cryolite in the extraction of Al :

  • In the extraction of aluminium, alumina Al2O3 is added to the cryolite (Na3AlF6) because it lowers the melting point of alumina from 2050°Cto 950°C.

Na3AlF6(aq)3Na+(aq)+AlF63-(aq)Al2O3(s)+4AlF63-(aq)3Al2OF62-(aq)+6F-(aq)

  • It enhances the conductivity of the electrolytic solution.

Hence, the function of cryolite in the extraction of Al is to enhance the conductivity and lowers the melting point of alumina.


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