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Questions  >>  SAT  >>  Chemistry  >>  chemical equilibrium
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Q)

The dissociation constant of a substituted benzoic acid at $25C$ is $1.0 \times 10^{-4}$. The $p^{H}$ of $0.01\;M$ solution its sodium salt is

$\begin{array}{1 1} (a)\;0 \\(b)\;1 \\ (c)\;7 \\ (d)\;8 \end{array} $

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A)
Solution :
$P^{H} =+\large\frac{1}{2}$$(P^kW+P^{k}a+\log C)$
$\qquad= \large\frac{1}{2} $$\times 14 +\large\frac{1}{2} $$\times 4 +\large\frac{1}{2} $$\log 10^{-1}$
$\qquad= 7+2-1=8$
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