An amphoteric substance is -a substance that can act as both acids and base by being both proton acceptor and proton donora substance that acts as an acid by being both a proton acceptor and a proton donora substance that acts as a base by being both a proton acceptor and a proton donorwhen a hydronium ion from a base reacts with a hydroxide ion from an acid to water and a salta base that forms when an acid loses a proton

Question

Toppr Admin · Accepted Answer

An amphoteric substance is a substance that can act as both acids and base by being both proton acceptor and proton donor.

Thus the bicarbonate ion $H C O_{3}^{-}$ is an amphoteric substance.

$H C O_{3}^{-} \to C O_{3}^{2 -} + H^{+}$ (bicarbonate ion as an acid)

$H C O_{3}^{-} + H^{+} \to H_{2} C O_{3}$ (bicarbonate ion as a base)

Hence, the correct option is A.