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Q.

A saturated solution of silver benzoate $C_{6} H_{5} {CO}_{2} Ag$ has a pH of 8.63, $K_{α}$ as benzoic acid is $6.5 x 10^{- 5}$ . Estimate the value of K of silver $sp$ benzoate:

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a

$1.287 \times 10^{- 2}$

b

$1.399 \times 10^{- 2}$

c

^{None of these}

d

$1.49 \times 10^{- 3}$

answer is B.

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Detailed Solution

$\begin{array}{l} pH = \frac{1}{2} [p K_{w} + p K_{a} + \log c] \Rightarrow c = 0.118 \\ k_{s p} = c^{2} = 1.399 \times 10^{- 2} \end{array}$

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