MCQ
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
    $4$
  • $10$
  • D
    $10.5$

Answer

Correct option: C.
$10$
c
$\mathrm{K}_{\mathrm{a}}=\mathrm{K}_{\mathrm{b}}$ and $\mathrm{C}_{\mathrm{Acid}}=\mathrm{C}_{\mathrm{Base}}$

$pH=pOH$$=4$

$\therefore \quad \mathrm{pH}$ of base $=14-\mathrm{pOH}=10$

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