Nitrates
NO₃⁻
All nitrates are soluble — no exceptions.
Soluble
Acetates
CH₃COO⁻
Exceptions: Ag⁺ and Hg₂²⁺ are only sparingly soluble.
Perchlorates & chlorates
ClO₄⁻ / ClO₃⁻
Exceptions: KClO₄ is only slightly soluble.
Group 1 & ammonium
Na⁺, K⁺, NH₄⁺
All common salts of these cations dissolve.
Chlorides
Cl⁻
Exceptions: AgCl, Hg₂Cl₂, PbCl₂ (PbCl₂ dissolves in hot water).
Bromides
Br⁻
Exceptions: AgBr, Hg₂Br₂, PbBr₂.
Iodides
I⁻
Exceptions: AgI, Hg₂I₂, PbI₂, HgI₂.
Sulfates
SO₄²⁻
Exceptions: BaSO₄, SrSO₄, PbSO₄ are insoluble; CaSO₄ and Ag₂SO₄ are slightly soluble.
Hydroxides
OH⁻
Exceptions: Group 1 hydroxides and Ba(OH)₂ are soluble; Ca(OH)₂ and Sr(OH)₂ are slightly soluble.
Sulfides
S²⁻
Exceptions: Group 1, group 2 and NH₄⁺ sulfides dissolve.
Carbonates
CO₃²⁻
Exceptions: Group 1 and NH₄⁺ carbonates are soluble.
Phosphates
PO₄³⁻
Exceptions: Group 1 and NH₄⁺ phosphates are soluble.
Chromates
CrO₄²⁻
Exceptions: Group 1, NH₄⁺, Ca²⁺ and Mg²⁺ chromates are soluble.
Sulfites
SO₃²⁻
Exceptions: Group 1 and NH₄⁺ sulfites are soluble.