Which of the following substances show increased solubility as the pH of the solution becomes more acidic? Write equations for the reactions that occur to increase the solubility.
• Ag3PO4, Ksp = 1.8 x 10-18
• CaCO3, Ksp = 8.7 x 10-9
• Hg2Cl2, Ksp = 1.1 x 10-18 (Hg22+ is the cation in solution.)
• PbI2, Ksp = 1.4 x 10-8
• CdCO3, Ksp = 5.2 x 10-12
• Sr3(PO4)2, Ksp = 1 x 10-31
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