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

$HNO_{2},CN^{-},HClO_{4},F^{-},OH^{-},CO_{3}^{-2} and S^{2-}$

Answers (1)

A conjugate acid-base pair means that the species are differed by only one proton. for example; $HCl$ is an acid because it donates a proton to water. So $HCl-Cl^-$ , and $H_3O^+-H_2O$ these pairs are called conjugate acid-base pair.

Species	Conjugate acid-base
$HNO_2$	$NO_2^{-}$ (Base)
$CN^-$	$HCN$ (Acid)
$HClO_4$	$ClO_4^-$ (base)
$F^-$	$HF$ (acid)
$OH^-$	$H_{2}O$ (acid)
$CO_3^{2-}$	$HCO_3^{-}$ (acid)
$S^{2-}$	$HS^{-}$ (acid)