MCQ
The $pH$ of a buffer solution containg $0.2$ mole per litre $C{H_3}COONa$ and $1.5$ mole per litre $C{H_3}COOH$ is ($Ka$ for acetic acid is $1.8 \times {10^{ - 5}})$
- ✓$4.87$
- B$5.8$
- C$2.4$
- D$9.2$
✓
Answer
Correct option: A.
$4.87$
(a) $pH = - {\text{log}}\,{K_a} + {\text{log}}\frac{{{\text{[Salt]}}}}{{{\text{[Acid]}}}}$
$ = - \log \,\,[1.8 \times {10^{ - 5}}] + \log \frac{{0.2}}{{0.1}} = 4.87$
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