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6-2.Equilibrium-II (Ionic Equilibrium)
medium
At $25\,^oC$, the dissociation constant of $CH_3COOH$ and $NH_4OH$ in aqueous solution are almost the same. The $pH$ of a solution $0.01\, N\, CH_3COOH$ is $4.0$ at $25\,^oC$. The $pH$ of $0.01\, N\, NH_4OH$ solution at the same temperature would be
A
$3$
B
$4$
C
$10$
D
$10.5$
Solution
$\mathrm{K}_{\mathrm{a}}=\mathrm{K}_{\mathrm{b}}$ and $\mathrm{C}_{\mathrm{Acid}}=\mathrm{C}_{\mathrm{Base}}$
$pH=pOH$$=4$
$\therefore \quad \mathrm{pH}$ of base $=14-\mathrm{pOH}=10$
Standard 11
Chemistry
