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

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(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 $(CH_{3})_{2}NH$ $(CH_{3})_{2}NH_{(aq)} + H_{2}O_{(l)} \rightleftharpoons (CH_{3})_{2}N{H_{2}}^{+}_{(aq)} + OH^{-}_{(aq)}$

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