Chapter 18 Part 2 Solubility and Complexation Equilibria

Temperature Dependence of Molar Solubility

Rationale’s for Insolubility

Solubility Product Constant Data Solubility Product Constants for Some Inorganic Compounds at 25  C SubstanceK SP SubstanceK SP Aluminum compounds Lead compounds AlAsO  10 –16 Pb 3 (AsO 4 ) x 10 –36 Al(OH) x 10 –33 PbBr x 10 –6 AlPO x 10 –20 PbCO x 10 –13 Antimony compounds PbCl x 10 –5 Sb 2 S x 10 –93 PbCrO x 10 –14 Barium compounds PbF x 10 –8 Ba 3 (AsO 4 ) x 10 –13 Pb(OH) x 10 –16 BaCO x 10 –9 PbI x 10 –9 BaC 2 O 4 ·2H 2 O*1.1 x 10 –7 Pb 3 (PO 4 ) x 10 –44 BaCrO x 10 –10 PbSeO 4.5 x 10 –7 BaF x 10 –6 PbSO x 10 –8 Ba(OH) 2 ·8H 2 O*5.0 x 10 –3 PbS8.4 x 10 –28

Examples of Precipitation Reactions

The Solubility Curve 0.1 M [Cl - ]

Strong complexes can solubilize salts

Complex Formation Equilibrium Constants

Solubility rules Solubility product (Ksp) Common ion effect Effect on solubility of adding ions already in equilibrium Effect on solubility of adding ligands Effect on solubility of pH Reaction quotients Concepts from Chapter 18 Part 2