Solubility Rules

Salts containing Group I elements

soluble

Salts containing ammonium (NH₄⁺)

soluble

Salts containing nitrate (NO₃^-)

generally soluble

Salts containing Cl^-, Br^-, or I^-

generally soluble

*halide salts of Ag⁺, Pb₂⁺, and (Hg₂)²⁺. Thus, AgCl, PbBr₂, and Hg₂Cl₂ are insoluble

Silver salts

most are insoluble

*AgNO₃ and Ag(C₂H₃O₂) are common soluble salts of silver

Sulfate salts

most are soluble

*CaSO₄, BaSO₄, PbSO₄, Ag₂SO₄ and SrSO₄ are all insoluble

Hydroxide salts

most are slightly insoluble
*Hydroxide salts of Group I elements are soluble
*Hydroxide salts of Group II elements (Ca, Sr, and Ba) are slightly soluble

Sulfides of transition metals

Very insoluble
*As, Sb, Bi, & Pb sulfides are also insoluble

Carbonates

usually insoluble

Chromates

usually insouble

Phosphates

usually insoluble

Fluorides

usually insoluble