General Water Solubility Guidelines
Soluble:
All Compounds of NO3-, NO2-, ClO3-, ClO4-,{CH3COO- Slightly Soluble}
All Compounds of Cl-, Br -, I-, SCN- (except Ag+, Hg22+ ,Pb2+ {PbCl2 Soluble in hot water})
All compounds of SO42- (except Sr2+, Ba2+, Pb2+ , {Ag+, Ca2+, Hg2+ Slightly})
Hydroxides: LiOH, NaOH, KOH, NH4 OH, Ca(OH)2, Sr(OH)2, Ba(OH)2
Mostly Insoluble:
Compounds of CO32-, PO43-, PO33-, SO32-,F-,S2-,AsO43-,AsO33-,SiO32- (except Na+, K+, NH4+)
Compounds of C2O42- (except Na+, K+, NH4+, Fe3+, {Mg2+ Slightly})
Compounds of CrO42-,(except Na+, K+, NH4+, Mg2+, Ca2+, Cu2+, Sr2+)