Question

Electrolysis of alumina is done...(write the chemical equation)​

Answer 1

Answer:

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Explanation:

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Answer 2

Electrolysis of the alumina/cryolite solution gives aluminium at the cathode and oxygen at the anode.

Al 3+ + 3e - Al (aluminium metal at the (-)cathode)

2O 2- - 4e - O2 (oxygen gas at the (+)anode)

Aluminium is more dense than the alumina/cryolite solution, and so falls to the bottom of the cell where it can be tapped off as pure liquid metal.

The overall reaction is

aluminium oxide aluminium + oxygen

2Al 2 3+ O3 2- (l) 4Al (l) + 3O 2(g)

Oxygen is discharged at the positive carbon (graphite) anode.Oxygen reacts with the carbon anode to form carbon dioxide gas.

carbon + oxygen carbon dioxide

C (s) + O2(g) CO 2(g)

The carbon anode slowly reacts to make carbon dioxide and needs to be replaced regularly.