AP Chem Solubility Guidelines

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NO₃

Soluble (no exceptions)

C2H2O2

Soluble (no exceptions)

Cl

Soluble (except compounds of Ag, Hg2, and Pb)

Br

Soluble (except compounds of Ag, Hg2, and Pb)

I

Soluble (except compunds of Ag, Hg2, and Pb)

SO4

Soluble (except compounds of Sr, Br, Hg2, and Pb)

S

Insoluble (except compounds of NH4, alkali metal cations, Ca, Sr, and Ba)

CO3

Insoluble (except compounds of NH4, and alkali metal cations)

PO4

Insoluble (except compounds of NH4 and the alkali metal cations)

OH

Insoluble (except compounds of alkali metal cations, Ca, Sr, and Ba)