The solubility of \(BaCO_3\) (molar mass \(197\,g\,mol^{-1}\)) is \(1.4\times10^{-3}\) g per 100 mL. The solubility product constant of \(BaCO_3\) is \(x\times10^{-9}\,mol^2L^{-2}\). The value of \(x\) (nearest integer) is:
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For salts of the type \(AB\),
\[
K_{sp}=s^2.
\]
For \(AB_2\) or \(A_2B_3\), always include the stoichiometric coefficients while writing \(K_{sp}\).