Solubility rules

Alkali Metals

Soluble

NH4+

Soluble

NO3-

Soluble

ClO3-

Soluble

ClO4-

Soluble

OH-

Mostly Insoluble. Exceptions include Alkali Metal Hydroxides and Ba(OH)2, Ca(OH)2 is slightly soluble.

Cl-

Mostly Soluble. Exceptions include Ag+, Hg2+, and Pb2+

Br-

Mostly Soluble. Exceptions include Ag+, Hg2+, and Pb2+

I-

Mostly Soluble. Exceptions include Ag+, Hg2+, and Pb2+

Carbonates (CO3 2-)

Mostly Insoluble. Exceptions include Alkali Metals, and the ammonium ion (NH4+)

Phosphates (PO4 3-)

Mostly Insoluble. Exceptions include Alkali Metals, and the ammonium ion (NH4+)

Sulfides S2-

Mostly Insoluble. Exceptions include Alkali Metals, and the ammonium ion (NH4+)

SO4 2-

Mostly Soluble. CaSO4 and Ag2SO4 are slightly soluble

BaSO4, HgSO4, and PbSO4 are insoluble