A) 10×10 mol/L of BaCl2 are added to a saturated BaSO4 solution. Given that the solubility product constant of barium sulfate is 1.2×10-10 find the equilibrium concentrations of Ba2+ and SO42- ions after the addition of BaCl2. B) The pH of an originally acidic solution containing 10-3 CaCl2 and 10-1 M oxalic acid (H2C204) is raised slowly. At what pH value will calcium oxalate (CaC204) first precipitate? ( Assume that CaCl2 completely dissociates into its constituent ions) Ksp (Ca C204) = 10-8.72 Kai = 10-1.19 Ka.2 = 10-4.21