Solubility Rules

soluble ionic compounds

Li+

Na+

K+

Rb+

Cs+

NH4+

NO3-

HCO3-

CH3COO-

ClO4-

ClO3-

soluble ionic compounds with exceptions

Cl- Br- I-

• Cl- Br- I- exceptions: compounds of Ag+, Hg2²⁺, and Pb2+

• SO4^2- exceptions: compounds of Ag+, Hg2²⁺, Pb2+, Ca2+, Sr2+, Ba2+

insoluble ionic compounds (all have exceptions)

• S2-, O2-, OH- exceptions: compounds of NH4+, the alkali metal cations, Ca2+, Sr2+, Ba2+

• CO3^2- , PO4^3- , CrO4^2- , F- exceptions: compounds of NH4+ and the alkali metal cations

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