Solubility Rules

nitrates (NO₃⁻)

soluble

acetates (C₂H₃O₂⁻ / CH₃COO⁻)

soluble

ammonium (NH₄⁺)

soluble

Alkali Metals

soluble

Li+

soluble

Na +

soluble

K+

soluble

Rb+

soluble

Cs+

soluble

Cl -

soluble (except with Ag 1+, Pb 2+, Hg2 2+)

Br -

soluble (except with Ag 1+, Pb 2+, Hg2 2+)

I-

soluble (except with Ag 1+, Pb 2+, Hg2 2+)

sulfates (SO₄²⁻)

soluble (except with Ag 1+, Pb 2+, Hg2 2+, Ca 2+, Sr 2+)

carbonates (CO₃²⁻)

Insolulble (except with NH4 1+, and Group 1 cations)

phosphates (PO₄³⁻)

Insolulble (except with NH4 1+, and Group 1 cations)

sulfides (S²⁻)

Insoluble (except with NH₄⁺, Group 1 cations, and Group 2 cations (Ca²⁺, Sr²⁺, Ba²⁺)

hydroxides (OH⁻)

Insoluble (except Group 1, NH₄⁺, and Ca²⁺, Sr²⁺, Ba²⁺ (slightly soluble)

chromates (CrO₄²⁻)

Insolulble (except with NH4 1+, and Group 1 cations)

sulfites (SO₃²⁻)

Insolulble (except with NH4 1+, and Group 1 cations)