The solubility product for a salt of the type AB is 4 10^ -8 . Wh… - Vidyadip

MCQ

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

A
$4 \times 10^{-4} \;mol / L$
✓
$2 \times 10^{-4} \;mol / L$
C
$16 \times 10^{-16} \;mol / L$
D
$2 \times 10^{-16} \;mol / L$

✓

Answer

Correct option: B.

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

b
For salt AB

$K_{ ap }=( s )^{2} \Rightarrow s =\sqrt{ K _{ sp }}$

$s =\sqrt{4 \times 10^{-8}}=2 \times 10^{-4} M$

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