Question

Explain: Al2O3 is reduced to aluminium by electrolysis​

Answer 1

Answer:

Aluminium oxide (Al2O3) is an ionic compound. When it is melted the Al3+ and O2- ions are free to move and conduct electricity. Electrolysis of the alumina/cryolite solution gives aluminium at the cathode and oxygen at the anode. 4Al3+ + 12e- → 4Al (aluminium metal at the (-)cathode) reduction.

Explanation:

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Answer 2

Answer:

Reaction at cathode(-)

Al3+ + 3e-= Al (reduction)

Reaction at anode (+)

2O^2-= O2+ 4e-

(oxidation)

Explanation:

Aluminium is manufactured by the electrolysis of molten alumina (Al2O3).The ore Bauxite is purified by

treating with sodium hydroxide which removes impurities like iron oxide and sand. Purified bauxite is called

alumina.

Alumina is dissolved in molten cryolite (Na3AlF6),

a) to reduce the melting point to 900 0C,

b) to increase its conductivity and

c) save energy.

The mixture is electrolysed in Hall Heroult cell using inert electrodes(graphite)

Al2O3 contains Al3+ and O2- ions.