Science, asked by pathadeujwal01, 1 month ago

Draw and label the diagram of electrolysis
of alumina and explain the electrolytic
reduction of alumina.​

Answers

Answered by XxpoonamxX
4

Answer:

If Bauxite contains Fe

2

O

3

as impurity, it is purified by Baeyer's process.

Electrolysis of alumina (Hall-Heroult process): Electrolysis of alumina is done in an iron tank fitted with a lining of gas carbon which acts as cathode. Graphite rods act as anode and a bulb is fitted in parallel as indicator for alumina content. The electrolyte is a mixture of alumina and cryolite (Na

3

AlF

6

). The melting point of alumina is very high (2050

o

C). But, in presence of cryolite (Na

3

AlF

6

) and fluorspar (CaF

2

), it melt at 870

o

C. Then pure alumina is added to the tank which dissolve in cryolite mixture.

Reaction: Reaction take place as below

Na

3

AlF

6

→3NaF+AlF

3

AlF

3

→Al

3+

3F

3F

→3e

+3F (oxidation) at anode

Al

3+

3e

→Al (reduction) at cathode

2Al

2

O

3

+12F→4AlF

3

+3O

2

solution

Answered by athamadaswp
2

Answer:

hope this helps you alor

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