MCQ
$p{K_a}$ value for acetic acid at the experimental temperature is $5$. The percentage hydrolysis of $0.1\,\,M$ sodium acetate solution will be
- A$1 \times {10^{ - 4}}$
- ✓$1 \times {10^{ - 2}}$
- C$1 \times {10^{ - 3}}$
- D$1 \times {10^{ - 3}}$
✓
Answer
Correct option: B.
$1 \times {10^{ - 2}}$
(b) $pK_a = 5$, so $K_a = 1 \times {10^{ - 5}}$
$\alpha = \sqrt {\frac{{K_a}}{C}} = \sqrt {\frac{{1 \times {{10}^{ - 5}}}}{{0.1}}} = 1 \times {10^{ - 2}}$
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