In $H N O_{3} (a q) + O H^{-} (a q) ⟶ H_{2} O (l)$ + $N O_{3}^{-} (a q)$ , which species is the conjugate acid?

H N O_{3} (a q)

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O H^{-} (a q)

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H_{2} O (l)

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N O_{3}^{-} (a q)

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There is no conjugate acid

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Solution

The correct option is B $H_{2} O (l)$
${H N O}_{3} + {O H}^{-} \to H_{2} O + {N O}_{3}^{-}$
$(C A)$ Conjugate acid is the base obtained after protonation
So, $H_{2} O$ is $C A$ of ${O H}^{-}$ $(∵ {O H}^{-}      + H^{+} = H_{2} O)$
base $C A$

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