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(A) $Br	ext{ø}nsted$ acid is a proton $(H^+)$ donor,and a $Br	ext{ø}nsted$ base is a proton $(H^+)$ acceptor.Species that can act as both are called

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$HSO_4^-$

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(A) $Br	ext{ø}nsted$ acid is a proton $(H^+)$ donor,and a $Br	ext{ø}nsted$ base is a proton $(H^+)$ acceptor.Species that can act as both are called amphoteric.For $HSO_4^-$,it can donate a proton to form $SO_4^{2-}$ $(HSO_4^- ightarrow H^+ + SO_4^{2-})$ and accept a proton to form $H_2SO_4$ $(HSO_4^- + H^+ ightarrow H_2SO_4)$.Therefore,$HSO_4^-$ is amphoteric.

Which of the following species can act as both a $Br\text{ø}nsted$ acid and a $Br\text{ø}nsted$ base?

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