Practice!

Sample Problem

Which of the following ionic compounds are soluble in water?

KNO3

AgCl

BaSO4

NaCl

NaOH

Solution

KNO3, NaCl, and NaOH are soluble in water. AgCl and BaSO4 are insoluble in water. Generally, compounds composed of alkali metal or NH4+ cations are soluble. Compounds composed of monovalent anions are generally soluble (AgCl is an exception). Compounds composed of divalent cations/anions are generally insoluble (sulfates are an exception).