Chemist’s Tools: Solubility Rules!!

The following table summarizes the solubility ionic compounds in water formed with these common anions . Use this as a guide to predict products of chemical reactions for double-replacement reactions.

Anions
Soluble
Insoluble
Nitrates, NO3
ALL


Acetates, C2H3O2

ALL

Chlorides, Cl

ALL, except …
AgCl, Hg2Cl2, PbCl2
Sulfates, SO42-

ALL*, except …
BaSO4, SrSO4, PbSO4
Salts of group IA

ALL

Salts of ammonium, NH4+

ALL

Acids

ALL

Oxides, O2- Group IA,
Group IIA (Ca, Sr, Ba)

ALL
Hydroxides, OH Group IA,
Group IIA (Ca*, Sr, Ba)

ALL
Sulfides, S2- Group IA, Group IIA, (NH4)2S
ALL

Phosphates, PO43- Group IA, (NH4)3PO4

ALL
Carbonates, CO32- Group IA, (NH4)2CO3

ALL

* Ca(OH)2, CaSO4 are moderately soluble.

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