a. Aluminium is extracted from its chief ore bauxite.
1. Write 3 balanced equations for the purification of bauxite by Baeyer's process.
2)Why the anode need to be replace from time to time.
3)Write the equation for the reaction which takes place at anode and cathode during the extraction
aluminium by electrolysis process.
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Answer:
Concentration of ore is done by baeyer's process using chemical method.
The electrolytic reduction of alumina is done by hall heroult's process. The reaction at cathode is : 2Al
3+
+6e
−
→2Al Thus pure aluminium metal is formed at the cathode.
Cryolite is sodium aluminium fluoride (Na
3
AlF
6
). It ia an ore of aluminium. Cryolite and fluorspar acts as an solvent.
Al(OH)
3
→Al
2
O
3
+water
The oxygen evolved at the anode escapes as a gas or reacts with the carbon anode. The anode is thus oxidized to carbon monoxide which either burns giving CO
2
or escapes. Thus, anode has to be replaced as it is consumed periodically.
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