Solubility Rules

Compounds containing alkali metals.
Soluble.
Salts containing NH4+, NO3-, ClO4-, and C2H3O2-.
Soluble.
Salts containing Cl-, Br-, or I- (except when combined with Ag+, Pb2+, or Hg22+).
Soluble.
All sulfates (salts containing SO42-) except those of Pb2+, Ca2+, Sr2+, Hg22+, and Ba2+.
Soluble.
All metal hydroxides (ionic compounds containing OH-) and all metal oxides (ionic compounds O2-) except those of Group IA and of Ca2+, Sr2+, and Ba2+.
Insoluble.
All salts that contain PO43-, CO32-, SO32-, and S2- except those of Group IA and NH4+.
Insoluble.

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