Solubility Rules

 

Soluble                                                                      Insoluble

 

All alkali metals (always)

NH4+ compounds (always)

 

All NO3-, ClO3-, C2H3O2- (always)

 

All Cl-, Br-, I-                                       ®                    Except:  Ag+, Pb2+, Hg22+

 

All SO42-                                             ®                    Except:  Sr2+, Ba2+, Hg2+, Pb2+

 

Except:  Ca2+, Ba2+, Sr2+                  ¬                    All hydroxides

 

Strong Acids:  HCl, HBr, HI                          All carbonates, chromates, sulfides,

HNO3, HClO3                                   fluorides, phosphates, oxides, silicates,  

HClO4, H2SO4                                  oxalates

 

All molecules, solids, liquids, and gases