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Q.

The pH of the solution containing 50mL each of 0.1M sodium acetate and 0.01M acetic acid is:
(Given: pKa of acetic acid is 4.57)

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a

5.57

b

9.43

c

4.57

d

3.57

answer is B.

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Detailed Solution

$\begin{array}{l} pH = p^{ka} + \log_{10} \frac{[salt]}{[Acid]} \\ pH = 4.57 + \log_{10} \frac{N_{s} V_{s}}{N_{A} V_{A}} \\ pH = 4.57 + \log_{10} \frac{0.1 \times 50}{0.01 \times 50} \\ pH = 4.57 + \log_{10}^{10^{1}} \\ pH = 4.57 + 1 \\ pH = 5.57 \end{array}$

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