Select the species which can act as an acid as well as base.

{S O}_{4}^{2 -}

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{H S}^{-}

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H C O_{3}^{-}

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H {S O}_{4}^{-}

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Solution

The correct options are
A ${H S}^{-}$
C $H C O_{3}^{-}$
D $H {S O}_{4}^{-}$
$H S^{-}, H C O_{3}^{-}$ and $H S O_{4}^{-}$ are the species which can act as acid and base as they are amphoteric.

The Bronsted-Lowry acid/base definition defines an acid as a proton donator, and a base as a proton acceptor. These species have the capacity to both accept or donate a proton depending on whether the environment it is in is acidic or basic.

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The species: H₂O,, and NH₃ can act both as Brönsted acids and bases. For each case give the corresponding conjugate acid and base.

{N H}_{3}, {H S O}_{4}^{-}, H_{2} {S O}_{4}, {H C O}_{3}^{-}, H_{3} O

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