Which among the following represent the conjugate acid/base pairs?

H_{3} O^{+} / H_{2} O

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

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H {C O}_{3}^{-} / {C O}_{3}^{2 -}

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All are conjugate acid/ base pairs

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Solution

The correct options are
A $H_{3} O^{+} / H_{2} O$
C $H {C O}_{3}^{-} / {C O}_{3}^{2 -}$
A conjugate acid-base pair is a pair of acid and base which are formed by acid donating $H^{+}$ ion to base which accepts it.

They differ by $H^{+}$ ion.
Option-A:
$H_{2} O$ accepts $H^{+}$ ion to give $H_{3} O^{+} .$
They are acid-base conjugate pair.
Option-C
$H C O_{3}^{-}$ donates $H^{+}$ to give $C O_{3}^{2 -}$
They are acid-base conjugate pair.

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

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H C O_{3}^{-}

H C O_{3}^{-} + H_{2} O ⇌ H_{3} O^{+} + C O_{3}^{2 -}

H C O_{3}^{-} + H_{2} O \to C O_{3}^{2 -} + H_{3} O^{+}

H C O_{3}^{-}

H F, H_{2} {S O}_{4}

{H C O}_{3}^{-}

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