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The solubility product for a salt of the type AB is 4 × 10–8. What is the molarity of its standard solution?

(1) 4 × 10–4 mol/L 

(2) 2 × 10–4 mol/L

(3) 16 × 10–16 mol/L 

(4) 2 × 10–16 mol/L

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Equilibrium, solubility equilibria

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Ans: (2) 2 × 10–4 mol/L

Sol. For salt AB

$K_{sp}=(s)^2\implies s=\sqrt{K_{sp}}$

$s=\sqrt{4\times10^{-8}}=2\times10^{-4}M$

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