| Term | Definition |
| always soluble | compounds with Li⁻ |
| always soluble | compounds with Na+ |
| always soluble | compounds with K+ |
| always soluble | compounds with Cs+ |
| always soluble | compounds with Rb+ |
| always soluble | compounds with NH₄+ |
| always soluble | compounds with NO₃⁻ |
| always soluble | compounds with C₂H₃O₂⁻ |
| always soluble | compounds with ClO₃ |
| always soluble | compounds with ClO₄⁻ |
| usually soluble | Cl⁻ (except when combined w/ Ag+, Pb²+, Hg₂²+) |
| usually soluble | Br⁻ (except when combined w/ Ag+, Pb²+, Hg₂²+) |
| usually soluble | I⁻ (except when combined w/ Ag+, Pb²+, Hg₂²+) |
| usually soluble | SO₄²⁻ (except Ca²+, Ba²+, Sr²+, Pb²+: CBS & PBS) |
| usually not soluble | O²⁻ (except alkali and Ca²+, Ba²+, Sr²+: CBS) |
| usually not soluble | OH⁻ (except alkali and Ca²+, Ba²+, Sr²+: CBS) |
| never soluble | CO₃²⁻ (except NH₄+ & alkali metal ions; may dissolve in acid solutions because of gas formation) |
| never soluble | SO₃²⁻ (except NH₄+ & alkali metal ions; may dissolve in acid solutions because of gas formation) |
| never soluble | S²⁻ (except NH₄+ & alkali metal ions; may dissolve in acid solutions because of gas formation) |
| never soluble | PO₄³⁻ (except NH₄+ & alkali metal ions; may dissolve in acid solutions because of gas formation) |