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In one well developed paragraph, explain how aluminum is obtained from natural bauxite. Relate your explanation...

In one well developed paragraph, explain how aluminum is obtained from natural bauxite. Relate your explanation to redox reactions.

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Answer #1

In the metallurgy of aluminium , purified Al2O3 mixed with Na3AlF6 which lowers the melting point and brings the conductivity,.

The fused matrix is electrolysed. steel cathode and graphite anode are used.

overall reaction as follow.

2Al2O3 + 3C -----------------> 4Al + 3CO2

at anode:   Al+3 + 3e- -----------> Al

at cathode: C + O-2 ----------------> CO + 2e-

                  C + 2O-2 ----------------> CO2 + 4e-

this process of of electrolysis is widely known as Hall-Heroult process.

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