Solubility Table

 

 

Ionic compounds containing the following ions are generally soluble in water:

1. alkali metal ions and the ammonium ion: Li⁺, Na⁺, K⁺, NH₄⁺

2. acetate ion: C₂H₃O₂^-

3. nitrate ion: NO₃^-

4. halide ions: (X = Cl^-, Br^-, I^-)  (AgX, Hg₂X₂, and PbX₂ are exceptions and insoluble)

5. sulfate ion: SO₄^2-  (SrSO₄, BaSO₄, and PbSO₄ are exceptions and insoluble)

 

Ionic compounds containing the following ions are generally insoluble in water:

6. carbonate ion: CO₃^2-  (see Rule 1 exceptions, which are soluble)

7. chromate ion: CrO₄^2-  (see Rule 1 exceptions, which are soluble)

8. phosphate ion: PO₄^3-  (see Rule 1 exceptions, which are soluble)

9. sulfide ion: S^2-  (CaS, SrS, BaS, and Rule 1 exceptions, which are soluble)

10. hydroxide ion: OH^-  (Ca(OH)₂, Sr(OH)₂, Ba(OH)₂, and Rule 1 exceptions, which are soluble)