Solubility: Mostly Insoluble

For example:

• The solubility rules state that, with some exceptions, compounds containing the CO32− ion are insoluble.

• Compounds such as CaCO3, FeCO3, SrCO3, and CuCO3 do not dissolve in water.

• Note that the solubility rules contain many exceptions.

For example, compounds containing CO32− are soluble when paired with Li+, Na+, K+, or NH4+.

• Thus, Li2CO3, Na2CO3, K2CO3, and (NH4)2CO3 are soluble.