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Question
Write reactions to justify amphoteric nature of aluminium.
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Solution
A substance is called amphoteric if it displays characteristics of both acids and bases. Aluminium dissolves in both acids and bases, showing amphoteric behaviour
1) \[\ce{2Al_{(s)} + 6HCl_{(aq)} -> 2Al^{3+}_{(aq)} + 6Cl^-_{(aq)} + 3H_{2(g)}}\]
2)
\[\ce{2Al_{(s)} + 2NaOH_{(aq)} + 6H_2O_{(l)} -> 2Na^+[Al(OH)_4]^-_{(aq)} + 3H_{2(g)}}\]
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