| Soluble Compounds | Exceptions |
| Lithium, sodium, potassium, and ammonium (NH4+) compounds | None |
| Acetates (C2H3O2–)and nitrates (NO3–) | None |
| Bicarbonates (HCO3–) | None |
| Fluorides | CaF2 |
| Chlorides, bromides, iodides | Silver (ex. AgCl), lead (ex. PbCl2), and mercury (ex. Hg2Cl2) compounds. |
| Sulfates (SO42-) | CaSO4, SrSO4, BaSO4, PbSO4 |
| Insoluble Compounds | Exceptions |
| Carbonates (CO32-) and phosphates (PO43-) | Lithium, sodium, potassium, and ammonium compounds. |
| Hydroxides (OH–) and sulfides | Lithium, sodium, potassium, ammonium, calcium, and barium compounds. |
| Oxalates (C2O42-) | Lithium, sodium, potassium, and ammonium compounds.. MgC2O4 is somewhat soluble. |