Question

Give reason why cryolite is added in refining of aluminium

Answer 1

Answer:

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Explanation:

The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost effective.

Molten cryolite serves as a solvent for the molten aluminium oxide and increases the conductivity of the solution.

Answer 2

• Cryolite ( Na3AlF6 )is the main ore of Aluminium. It is an ore which contains aluminum and is found abundantly on the Earth's crust. So, cryolite is used in the extraction of Aluminium.

• It is dissolved in molten cryolite – an Aluminium compound with a lower melting point than Aluminium oxide. The use of molten cryolite as a solvent reduces some of the energy costs involved in extracting Aluminium by allowing the ions in Aluminium oxide to move freely at a lower temperature.

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