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Q. Fill in the blanks in the given table with the appropriate choice.
Species Conjugate acid Conjugate base
$HCO^{-}_{3}$ $\underline{p}$ $Co^{2-}_{3}$
$HSO^{-}_{4}$ $H_{2}SO_{4}$ $\underline{q}$
$NH_{3}$ $\underline{r}$ $\underline{s}$
$H_{2}O$ $\underline{t}$ $OH^{-}$

$p$ $q$ $r$ $s$ $t$
(a)$\,\,$ $H_{2}CO_3\,\,$ $SO^{2-}_4\,\,$ $NH^+_4\,\,$ $NH^-_2\,\,$ $H_3O^+\,\,$
(b)$\,\,$ $HCO^-_3\,\,$ $H_2SO_3\,\,$ $NH^-_2\,\,$ $NH^+_4\,\,$ $H_3O^+\,\,$
(c)$\,\,$ $H_{2}CO_3\,\,$ $H_2SO_4^-\,\,$ $NH^+_4\,\,$ $NH^-_2\,\,$ $H_2O\,\,$
(d)$\,\,$ $HCO^-_3\,\,$ $H_2SO_4\,\,$ $NH^+_2\,\,$ $NH^-_2\,\,$ $OH^-$

Equilibrium

Solution:

Species Conjugate acid Conjugate base
(a)$\,\,$ $HCO^-_3\,\,$ $H_2CO_3\,\,$ $CO^{2-}_3\,\,$
(b)$\,\,$ $HSO^-_4\,\,$ $H_2SO_4\,\,$ $SO^{2-}_4\,\,$
(c)$\,\,$ $NH_3\,\,$ $NH^+_3\,\,$ $NH^-_2\,\,$
(d)$\,\,$ $H_2O\,\,$ $H_3O^+\,\,$ $OH^-\,\,$