Solubility Rules

Li

Soluble

Na

Soluble

K

Soluble

NH₄

Soluble

NO₃^-

Soluble and always forms soluble salts.

C₂H₃O₂^-

Soluble and forms soluble salts with most cations.

Cl^-

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

Br^-

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

I^-

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

SO₄^2-

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

OH^-

Insoluble except when with Li⁺, Na⁺, K⁺, or NH₄⁺

Soluble when paired with Ca²⁺, Sr²⁺, or Ba²⁺

S^2-

Insoluble except when with Li⁺, Na⁺, K⁺, or NH₄⁺

Slightly Soluble when with Ca²⁺, Sr²⁺, or Ba²⁺

CO₃^2-

Insoluble except when with Li⁺, Na⁺, K⁺, or NH₄⁺

PO₄^3-

Insoluble except when with Li⁺, Na⁺, K⁺, or NH₄⁺