Write the equilibrium equation and the \(K_{s p}\) expression for each of the following. (a) \(\mathrm{Co}_{2} \mathrm{~S}_{3}\) (b) \(\mathrm{PbCl}_{2}\) (c) \(\mathrm{Zn}_{2} \mathrm{P}_{2} \mathrm{O}_{7}\) (d) \(\mathrm{Sc}(\mathrm{OH})_{3}\)

Question: Write the equilibrium equations and solubility product constant expressions (\(K_{sp}\)) for each of the following compounds: (a) \(\mathrm{Co}_{2} \mathrm{S}_{3}\), (b) \(\mathrm{PbCl}_{2}\), (c) \(\mathrm{Zn}_{2} \mathrm{P}_{2} \mathrm{O}_{7}\), and (d) \(\mathrm{Sc}(\mathrm{OH})_{3}\). Answer: (a) \(\mathrm{Co}_{2} \mathrm{S}_{3} \leftrightharpoons 2 \mathrm{Co}^{3+} + 3 \mathrm{S}^{2-}\) \(K_{sp} = [\mathrm{Co}^{3+}]^2[\mathrm{S}^{2-}]^3\) (b) \(\mathrm{PbCl}_{2} \leftrightharpoons \mathrm{Pb}^{2+} + 2 \mathrm{Cl}^{-}\) \(K_{sp} = [\mathrm{Pb}^{2+}][\mathrm{Cl}^-]^2\) (c) \(\mathrm{Zn}_{2} \mathrm{P}_{2} \mathrm{O}_{7} \leftrightharpoons 2 \mathrm{Zn}^{2+} + 2 \mathrm{P} \mathrm{O}_{4}^{3-}\) \(K_{sp} = [\mathrm{Zn}^{2+}]^2[\mathrm{P} \mathrm{O}_{4}^{3-}]^2\) (d) \(\mathrm{Sc}(\mathrm{OH})_{3} \leftrightharpoons \mathrm{Sc}^{3+} + 3 \mathrm{OH}^-\) \(K_{sp} = [\mathrm{Sc}^{3+}][\mathrm{OH}^-]^3\)