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Acetate
C2H3O2-
Carbonate
CO32-
Hydrogen Carbonate 
(bicarbonate)
HCO3-
Hydroxide
OH-
Nitrite
NO2-
Nitrate
NO3-
Chromate
CrO42-
Dichromate
Cr2O72-
Phosphate
PO43-
Hydrogen Phosphate
HPO42-
Dihydrogen Phosphate
H2PO4-
Ammonium
NH4+
Hypochlorite
ClO-
Chlorite
ClO2-
Chlorate
ClO3-
Perchlorate
ClO4-
Permanganate
MnO4-
Sulfite
SO32-
Hydrogen Sulfite
(bisulfite)
HSO3-
Sulfate
SO42-
Hydrogen Sulfate
HSO4-
Cyanide
CN-
Peroxide
O22-
Cation Compounds Always Soluble Contain
Li+, Na+, K+, NH4+

No exceptions
Anion Compounds Always Solube Contain
NO3-, C2H3O2-

No exceptions
Anions Generally Soluble
Cl-, Br-, I-

Unless paired with Ag+, Hg22+, Pb2+
Polyatomic(s) Generally Soluble
SO42-

Unless paired with Sr2+, Ba2+, Pb2+, Ag+, Ca2+
Ions Generally Insoluble
OH- and S2-

When paired with Li+, Na+, K+, or NH4+, the resulting compounds are soluble

When S2- pairs with Ca2+, Sr2+, or Ba2+, the resulting compound is soluble

When OH- pairs with Ca2+, Sr2+, or Ba2+, the resulting compound is soluble
Polyatomics Generally Insoluble
CO32- and PO43-

When these ions pair with Li+, Na+, K+, or NH4+, the resulting compounds are soluble
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