Write reactions to justify the amphoteric nature of aluminium.
(N/A) substance is called amphoteric if it displays characteristics of both acids and bases. Aluminium dissolves in both acids and bases,showing amphoteric behaviour.
Reaction with acid:
$2 Al(s) + 6 HCl(aq) \rightarrow 2 AlCl_{3}(aq) + 3 H_{2}(g)$
Reaction with base:
$2 Al(s) + 2 NaOH(aq) + 6 H_{2}O(l) \rightarrow 2 Na[Al(OH)_{4}](aq) + 3 H_{2}(g)$
Reaction with acid:
$2 Al(s) + 6 HCl(aq) \rightarrow 2 AlCl_{3}(aq) + 3 H_{2}(g)$
Reaction with base:
$2 Al(s) + 2 NaOH(aq) + 6 H_{2}O(l) \rightarrow 2 Na[Al(OH)_{4}](aq) + 3 H_{2}(g)$
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