The ionic solids in the preceding pages have all been water-soluble to a significant extent.
It is important to realise that not all ionic solids are water-soluble.
To
predict whether an
ionic compound is water-soluble, it is common to
use a set of guidelines based on the composition of the compound. Those guidelines are given below and should be considered along with the solubility curves for compounds that have appeared on earlier pages.
Solubility prediction guidelines:
All nitrates are soluble (see KNO3 and NaNO3 above).
All common sodium, potassium, and ammonium compounds are soluble (see KCl, KBr, NaCl, NH4Cl above).
Common carbonates and hydroxides except sodium, potassium and ammonium are insoluble.
Common chlorides except lead and silver are soluble (see MgCl2 above).
Common sulfates except lead, calcium and barium are soluble (see CuSO4 above).