Write reactions to justify amphoteric nature of aluminium.
Write reactions to justify amphoteric nature of aluminium.
A substance is called amphoteric if it displays characteristics of both acids and bases. Aluminium dissolves in both acids and bases, showing amphoteric behaviour.
$2 \mathrm{Al}+6 \mathrm{HCl} \rightarrow 2 \mathrm{Al}^{+3}+6 \mathrm{Cl}^{-}+3 \mathrm{H}_{2}$
$2 \mathrm{Al}+2 \mathrm{NaOH}+6 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Na}^{+}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]^{-}+3 \mathrm{H}_{2}$
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