MCQ
One litre of a buffer solution containing $0.01M\ \ce{NH_4Cl}$ and $0.1M\ \ce{ NH_4OH }$ having $\ce{pK_b}$ of $5$ has $\ce{pH}$ of :
- A$9$
- ✓$10$
- C$6$
- D$7$
✓
Answer
Correct option: B.
$10$
$\text{pOH}=\text{pK}_{\text{b}}+\log\frac{[\text{salt}]}{[\text{base}]}$
$=5+\log\frac{0.01}{0.1}5+\log10^{-1}$
$=5-1=4$
$\therefore\text{pH}=14-4=10$
$=5+\log\frac{0.01}{0.1}5+\log10^{-1}$
$=5-1=4$
$\therefore\text{pH}=14-4=10$
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