Solubility of Ionic Compounds in Water

The following table summarizes the solubility ionic compounds in water formed with these common anions . Use this as a guide to predict products of chemical reactions for double-replacement reactions.

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Anions	Soluble	Insoluble
Nitrates, NO₃^-	ALL	-
Acetates, C₂H₃O₂^-	ALL	-
Chlorides, Cl^-	ALL, except ...	AgCl, Hg₂Cl₂, PbCl₂
Sulfates, SO₄^2-	ALL^*, except ...	BaSO₄, SrSO₄, PbSO₄
Salts of group IA	ALL	-
Salts of ammonium, NH₄⁺	ALL	-
Acids	ALL	-
Oxides, O^2-	Group IA, Group IIA (Ca, Sr, Ba)	ALL
Hydroxides, OH^-	Group IA, Group IIA (Ca^*, Sr, Ba)	ALL
Sulfides, S^2-	Group IA, Group IIA, (NH₄)₂S	ALL
Phosphates, PO₄^3-	Group IA, (NH₄)₃PO₄	ALL
Carbonates, CO₃^2-	Group IA, (NH₄)₂CO₃	ALL

^* Ca(OH)₂, CaSO₄ are moderately soluble.