STOICHIOMETRY

Comprehensive data on solubility of a wide variety of ionic compounds in water have been available for centuries.  Although quantitative data can be accessed as required, it is very important from an i/GCSE stage and beyond to know the likelihood of a particular ionic compound being soluble in water.  Exceedingly useful generalizations are available in the shape of SOLUBILITY RULES.  These should be learned thoroughly.  Doing so will pay dividends.