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प्रश्न
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
एका वाक्यात उत्तर
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उत्तर
In the extraction of aluminium, the metal is to be isolated from alumina (Al2O3) by carrying out its electrolytic reduction. The melting point of alumina veery high (2323K).
- It is therefore, mixed will cryolite ( Na2AlF6 ) which lowers its melting point to 1173 k.
- More over, cryolite also increase the electrical conductivity of alumina.
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