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State the conditions under which the pre...

State the conditions under which the preparation of alumina from aluminium is carried out. Give the necessary equations which need not be balanced.

Text Solution

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`Al + NaOH overset ("Aqueous") rarr NaAlO_(2) + H_(2) O`
`NaAlO_(2) overset(CO_(2)) rarr Al(OH)_(3) + Na_(2)CO_(3)`
`Al(OH)_(3) overset(Delta) rarr underset ("Alumina")(AlO_(3)) + H_(2)O`.
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