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, HBr, HI All carbonates, chromates, sulfides,

HNO3, HClO3 fluorides, phosphates, oxides, silicates,

HClO4, H2SO4 oxalates

 

All molecules, solids, liquids, and gases