Question

Answer the following questions:

Write the constituents of electrolyte for the

extraction of aluminum.

Answer 1

$\text{Pure alumina}\left({\text{Al}}_{\text{2}}{\text{O}}_{\text{3}}\right)$

$\text{Cryolite}\left({\text{Na}}_{\text{3}}{\text{AlF}}_{\text{6}}\right)\text{and}$

$\text{Fluorspar (CaF).}$

On passing electric current, aluminum ions are discharged at the cathode and the O-ions at the anode.

• Cryolite lowers the melting point of alumina to around $950°C$

Instead of $2000°C$ and makes it a good conductor

of Electricity

• Fluorspar increases the mobility of ions in the mixture and

acts as a solvent for the electrolytic mixture.

• Coke powder prevents the burning of carbon rods.