Solubility Rules

NH₄⁺ compounds

Always soluble

CH₃COO⁻ compounds

Always soluble

HCO₃⁻ compounds

Always soluble

ClO₃⁻ / ClO₄⁻ compounds

Always soluble

NO₃⁻ compounds

Always soluble

Li⁺ compounds

Always soluble

Na⁺ compounds

Always soluble

K⁺ compounds

Always soluble

Rb⁺ compounds

Always soluble

Cs⁺ compounds

Always soluble

Cl⁻ compounds

Usually soluble, insoluble with Ag⁺, Pb²⁺, Hg₂²⁺

Br⁻ compounds

Usually soluble, insoluble with Ag⁺, Pb²⁺, Hg₂²⁺

I⁻ compounds

Usually soluble, insoluble with Ag⁺, Pb²⁺, Hg₂²⁺

F⁻ compounds

Usually soluble, insoluble with Ag⁺, Pb²⁺, Mg²⁺, Ca²⁺

SO₄²⁻ compounds

Usually soluble,insoluble with Ba²⁺, Sr²⁺, Pb²⁺, Ca²⁺