Write examples of weak acids and weak bases and give their ionic equilibrium in aqueous solution.

(A) Weak acids and weak bases partially dissociate in aqueous solution,establishing an equilibrium between the undissociated molecules and the ions.

$A$. Weak Acids	Ionic Equilibriums
$1$. Acetic acid $(CH_{3}COOH)$	$CH_{3}COOH_{(aq)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + CH_{3}COO^{-}_{(aq)}$
$2$. Benzoic acid $(C_{6}H_{5}COOH)$	$C_{6}H_{5}COOH_{(aq)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + C_{6}H_{5}COO^{-}_{(aq)}$
$3$. Hydrocyanic acid $(HCN)$	$HCN_{(aq)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + CN^{-}_{(aq)}$
$4$. Formic acid $(HCOOH)$	$HCOOH_{(aq)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + HCOO^{-}_{(aq)}$

$B$. Weak Bases	Ionic Equilibriums
$1$. Ammonia $(NH_{3})$	$NH_{3(aq)} + H_{2}O_{(l)} \rightleftharpoons N{H_{4}}^{+}_{(aq)} + OH^{-}_{(aq)}$
$2$. Aniline $(C_{6}H_{5}NH_{2})$	$C_{6}H_{5}NH_{2(aq)} + H_{2}O_{(l)} \rightleftharpoons C_{6}H_{5}N{H_{3}}^{+}_{(aq)} + OH^{-}_{(aq)}$
$3$. Methylamine $(CH_{3}NH_{2})$	$CH_{3}NH_{2(aq)} + H_{2}O_{(l)} \rightleftharpoons CH_{3}N{H_{3}}^{+}_{(aq)} + OH^{-}_{(aq)}$
$4$. Dimethylamine $(CH_{3})_{2}NH$	$(CH_{3})_{2}NH_{(aq)} + H_{2}O_{(l)} \rightleftharpoons (CH_{3})_{2}N{H_{2}}^{+}_{(aq)} + OH^{-}_{(aq)}$