Choose the most correct answer : The solubility product of a sparingly soluble salt AX is 5.2 $\times$ 10–13. Its solubility in mol dm–3 is ______.

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The solubility product of a sparingly soluble salt AX is 5.2 $\times$ 10–13. Its solubility in mol dm–3 is bb(underline(7.2 xx 10^-7)). Explanation: Ksp = 5.2 $\times$ 10–13 \ce{\underset{s}{AX} ⇌ \underset{s}{A}^{-} + \underset{s}{X}^{+}} Ksp = [A–][X+] = s $\times$ s 5.2 $\times$ 10–13 = s2 sqrt(10^-13) = sqrt(10^-12) = 10–6 0.52 $\times$ 10–12 = s2 sqrt(0.52 xx 10^-12) = s 0.7211 $\times$ 10–6 = s s = 7.211 $\times$ 10–7

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