Solubility Rules for Ionic Compounds in Water
Rule 1:	Compounds of NH4+ and group 1A metal ions are soluble.
Rule 2:	Compounds of NO3–, ClO4–, ClO3– and C2H3O2– are soluble.
Rule 3:	Compounds of Cl –, Br – and I – are soluble except those of Ag+, Cu+, Tl+, Hg22+ and Pb2+.
Rule 4:	Compounds of SO42– are soluble except those of Ca2+, Sr2+, Ba2+ and Pb2+.
Rule 5:	Most other ionic compounds are insoluble.