Ncert Exercises & Solutions

7.39 The species: H2O, HCO3–, HSO4– and NH3 can act both as Brönsted acids and bases. For each case give the corresponding conjugate acid and base.

The table below lists the conjugate acids and conjugate bases for the given species.
Species Conjugate acid Conjugate base

$H_{2} O H_{3} O_{+} {OH}^{-}$
${HCO}_{3}^{-} H_{2} {CO}_{3} {CO}_{3}^{2 -}$
${HSO}_{4}^{-} H_{2} {SO}_{4} {SO}_{4}^{2 -}$
${NH}_{3} {NH}_{4}^{+} {NH}_{2}^{-}$