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Pure water is saturated with PbCl2. In this saturated solution, which of the following is true? a) Ksp = [Pb^2+][Cl^-] b) Ksp = [Pb^2+]^2[Cl^-] c) [Pb^2+] = [Cl^-] d) [Pb^2+] = 0.5[Cl^-]