What is meant by the conjugate acid-base pair? Find the conjugate acid/base for the following species.
${H N O}_{2}, {C N}^{-}, {H C l O}_{4} F^{-}, {O H}^{-}, {C O}_{3}^{2 -}$ and $S^{2 -}$

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Solution

Conjugate acid base pairs differ by a proton.
For example, $H C l, C l^{-}$ represents conjugate acid base pair.
The conjugate acid/base for the species ${H N O}_{2}, {C N}^{-}, {H C l O}_{4} F^{-}, {O H}^{-}, {C O}_{3}^{2 -}$ and $S^{2 -}$
are $N O_{2}^{-}, H C N, C l O_{4}^{-}, H F, H_{2} O$ (acid) or $O^{2 -}$ (base), $H C O_{3}^{-}$ and $H S^{-}$ respectively.

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