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Q.

The solubility product for a salt of the type AB is $4 \times 10^{- 8}$ . What is the molarity of its standard solution?

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a

$4 \times 10^{- 4} mol / L$

b

$2 \times 10^{- 4} mol / L$

c

$16 \times 10^{- 16} mol / L$

d

$2 \times 10^{- 16} mol / L$

answer is B.

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Detailed Solution

For salt AB

$\begin{array}{l} K_{sp} = (s)^{2} \Rightarrow s = \sqrt{K_{sp}} \\ s = \sqrt{4 \times 10^{- 8}} = 2 \times 10^{- 4} M \end{array}$

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