Ncert Exercises & Solutions

7.35 What is meant by the conjugate acid-base pair? Find the conjugate acid/base for the following species:

HNO2, CN–, HClO4, F –, OH–, CO32–, and S2–

A conjugate acid-base pair is a pair that differs only by one proton.
The conjugate acid-base for the given species is mentioned in the table below.
Species Conjugate acid-base

${HNO}_{2} {NO}_{2}^{-} (base)$
${CN}^{-} HCN (acid)$
${HCIO}_{4} {CIO}_{4}^{-} (base)$
$F^{-} HF (acid)$
${OH}^{-} H_{2} O (acid) / O^{2 -} (base)$
${CO}_{3}^{2 -} {HCO}_{3}^{-} (acid)$
$S_{2 -} {HS}^{-} (acid)$

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