Simple Rules for the Solubility of Salts in Water

Soluble

Soluble

All compounds of the alkali metals (Group 1A)

Soluble

All salts containing NH4^+, NO3^-, ClO4^-, ClO3^-, and C2H3O2^-

Soluble

Most salts containing Cl^-, Br^-, or I^-

Insoluble

Chlorides, bromides, or iodides combined with Ag^+, Pb^2+, or Hg2^2+

Soluble

Most sulfates (SO4^2-)

Insoluble

PbSO4, CaSO4, SrSO4, Hg2SO4 and BaSO4

Insoluble

Metal hydroxides and metal oxides (except those of Group 1A, Ca^2+, Sr^2+, and Ba^2+

Insoluble

Salts containing PO4^3-, CO3^2-, SO3^2-, and S^2- (except those of Group 1A and NH4^+