- All compounds of the ammonium ion (NH4+), and of Alkali metal (Group IA) cations, are soluble.
- All nitrates and acetates (ethanoates) are soluble.
- All chlorides, bromides and iodides are soluble EXCEPT those of silver, lead and mercury(I).
- All sulfates are soluble EXCEPT those of silver, lead, mercury(I), barium, strontium.
- All carbonates, sulfites and phosphates are insoluble EXCEPT those of ammonium and Alkali metal (Group IA) cations.
- All hydroxides are insoluble EXCEPT those of ammonium, barium and alkali metal (Group I) cations.
- All sulfides are insoluble EXCEPT those of ammonium, Alkali metal (Group I) cations and Alkali earth metal (Group II) cations.