Solubility Rules

Solubility of Group 1A compounds and NH₄⁺

All compounds are soluble, with no exceptions.

Solubility of nitrates (NO3-), acetates (C2H3O2-) , and perchlorates (ClO4-)

All are soluble, with no exceptions.

Solubility of chlorides (Cl-), bromides (Br-) , and iodides (I-)

All are soluble, except with Ag⁺, Pb²⁺, and Hg₂²⁺.

Solubility of sulfates (SO4²-)

All are soluble, except with Ba²⁺, Sr²⁺, Pb²⁺, Ca²⁺, and Hg₂²⁺.

Solubility of carbonates (CO3²-), phosphates (PO4³-), and sulfites (SO3²-)

All are insoluble, except with Group 1A and NH₄⁺.

Solubility of hydroxides (OH-)

All are insoluble, except with Group 1A, NH₄⁺, Ca²⁺, Sr²⁺, and Ba²⁺ (slightly soluble).

Solubility of sulfides (S^2-)

All are insoluble, except with Group 1A, Group 2A, and NH₄⁺.