Solubles and Insolubles

Compounds containing Group 1A (alkali metal) ions

Always soluble (no exceptions)

Compounds containing ammonium (NH₄⁺)

Always soluble

Compounds containing nitrate (NO₃⁻) or acetate (C₂H₃O₂⁻)

Always soluble

Compounds containing chlorate (ClO₃⁻) or perchlorate (ClO₄⁻)

Always soluble

Compounds containing chloride (Cl⁻), bromide (Br⁻), or iodide (I⁻)

Soluble, except with Ag⁺, Pb²⁺, or Hg₂²⁺

Compounds containing sulfate (SO₄²⁻)

Soluble, except with Ba²⁺, Sr²⁺, Pb²⁺, Ca²⁺, Hg₂²⁺

Compounds containing carbonate (CO₃²⁻) or phosphate (PO₄³⁻)

Insoluble, except with Group 1A ions or NH₄⁺

Compounds containing hydroxide (OH⁻) or oxide (O²⁻)

Insoluble, except with Group 1A ions, Ca²⁺, Sr²⁺, Ba²⁺

Compounds containing sulfide (S²⁻)

Insoluble, except with Group 1A, Group 2A, or NH₄⁺

Compounds containing chromate (CrO₄²⁻)

Insoluble, except with Group 1A ions, NH₄⁺, or Ca²⁺