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Reactions in Solution: Solubility   Compounds containing the following anions are soluble: NO3 - nitrate CH3COO - acetate ClO3 - chlorate All halides are soluble except: AgX, Hg2X2, PbX2, Hgx2 (note HgCl is soluble however) "X" often is used to represent a "generic" halide ion, i.e., X = F-, Cl-, Br-, or I- All sulfates are soluble except sulfates of: Ca2+, Sr2+, Ba2+, Ag+, Hg22+, Pb2+ Thus Na2SO4 would be soluble but CaSO4 would not. Sulfides are insoluble unless they are sulfides of: alkali metals alkaline earth metals ammonium ions Carbonates are insoluble except for: (NH4)2 CO3 alkali metal carbonates Ditto for phosphates Hydroxides are insoluble except for: alkali metal hydroxides hydroxides of Ba2+, Sr2+, Ca2+