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(A) Bronsted-Lowry acid is defined as a substance that releases $H^+$ ions,while a Bronsted-Lowry base is defined as a substance that accepts $H^+$ io

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$HSO_4^-$

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(A) Bronsted-Lowry acid is defined as a substance that releases $H^+$ ions,while a Bronsted-Lowry base is defined as a substance that accepts $H^+$ ions.In the given options,$Na_2CO_3$ acts as a base by accepting $H^+$ ions.$SO_4^{2-}$ can only accept $H^+$ ions to form $HSO_4^-$,so it acts only as a base.$HSO_4^-$ can accept $H^+$ to form $H_2SO_4$ (acting as a base) and can release $H^+$ to form $SO_4^{2-}$ (acting as an acid).Therefore,$HSO_4^-$ can act as both a Bronsted acid and a Bronsted base.

Which of the following species can act as both a Bronsted acid and a Bronsted base?

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