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Always Soluble Ions (>2g/100mL water dissolves)
Alkali metals, NH4+, NO3-, CH3CO2-
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Usually Soluble Ions (>2g/100mL water dissolves)
- Cl-, Br-, I- (except with Ag+, Hg22+, Hg2+, Pb2+)
- SO42- (except with Ca2+, Sr2+, Ba2+, Ag+, Hg22+, Hg2+, Pb2+)
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Usually Insoluble Ions (<2g/100mL water dissolves)
- OH-, O2- (except with Sr2+, Ba2+, and always soluble ions)
- PO43-, CO32-, SO32-, S2- (except with always soluble ions)
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