How does aluminum give aluminate ion in basic solution?

1 Answer
anor277
Apr 25, 2017

"Aluminate" can be produced by oxidation of "aluminum metal......."

Explanation:

Al(s) + 4HO^(-) rarr Al(OH)_4^(-) + 3e^- (i)

And if aluminum is oxidized, the only species that can be reduced is water to give dihydrogen gas:

H_2O + e^(-) rarr 1/2H_2(g) + HO^- (ii)

And so we add (i) +3xx(ii) and gets..........

Al(s) +3H_2O(l) + HO^(-) rarr Al(OH)_4^(-) + 3/2H_2(g)uarr

Aluminum is an amphoteric metal. Use of acid would result in a similar oxidation.

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