Reactions-Solubility Rules (for aqueous solutions)

NO₃⁻¹, C₂H₃O₂⁻¹, ClO₄⁻¹, ClO₃⁻¹

always soluble

alkali metals Cl⁻¹, Br⁻¹, I⁻¹, NH₄⁺¹

always soluble

Cl⁻¹, Br⁻¹, I⁻¹

soluble except with Ag⁺¹, Pb⁺², Hg₂⁺²

SO₄⁻²

soluble except with Pb⁺², Hg₂⁺², Sr⁺², Ca⁺², Ba⁺²

OH⁻¹

insoluble except with Ca⁺², Sr⁺², Ba⁺²

PO₄⁻³, S⁻², CO₃⁻², SO₃⁻²

insoluble except with alkali metals or NH₄⁺¹

Acids

soluble acids = HCl, HBr, HI, HNO₃, HClO₄, H₂SO₄