Chapter 4 Solubility Rules

alkali metals (Group IA) compounds

always soluble

Ammonium (NH4+) compounds

always soluble

Nitrates (NO3-), Acetates (C2H302-), Chlorates (ClO3-), Perchlorates (Cl04-)

always soluble

Most Chlorides (Cl-), Bromides (Br-), Iodides

exceptions include:

soluble

(exceptions for compounds containing Ag+, Hg+, PB+2)

Most sulfates (SO4^-3)

exceptions include:

soluble

(CaSO4, SrSO4, and Ag2SO4 are slightly soluble)
(BaSO4, HgSO4 and PbSO4 are insoluble)

Most hydroxides (OH-)

and exceptions include:

insoluble

(The exceptions are the alkali metal hydroxides and Ba(OH)2).
(The alkaline earth metals like Ca(OH)2 is slightly soluble)

Carbonates (CO3-2), phosphates (PO4-3), chromates (CrO42-), fluorides (F-), and sulfides (S-2)

exceptions include:

usually insoluble

The exceptions are the alkali metals and the ammonium ion (NH4+)

Ag+ compounds

exceptions include:

insoluble

exceptions are AgNO3 and AgC2H3O2