Solubility Rules
Soluble Insoluble
All alkali metals (always)
NH4+ compounds (always)
All NO3-, ClO3-, C2H3O2- (always)
All Cl-, Br-, I- ® Except: Ag+, Pb2+, Hg22+
All SO42- ® Except: Sr2+, Ba2+, Hg2+, Pb2+
Except: Ca2+, Ba2+, Sr2+ ¬ All hydroxides
Strong Acids: HCl,
HNO3, HClO3 fluorides, phosphates, oxides, silicates,
HClO4, H2SO4 oxalates
All molecules, solids, liquids, and gases