Common Polyatomic Ions

H2PO4^-
Dihydrogen phosphate
C2H3O2^-
Acetate
HSO3^-
Hydrogen sulfite
HSO4^-
Hydrogen sulfate
HCO3^-
Hyrogen carbonate
NO2^-
Nitrite
NO3^-
Nitrate
CN^-
Cyanide
OH^-
Hydroxide
MnO4^-
Permanganate
ClO^-
Hypochlorite
ClO2^-
Chlorite
ClO3^-
Chlorate
ClO4^-
Perchlorate
HPO4^2-
Hydrogen phosphate
C2O4^2-
Oxalate
SO3^2-
Sulfite
SO4^2-
Sulfate
CO3^2-
Carbonate
CrO4^2-
Chromate
Cr2O7^2-
Dichromate
SiO3^2-
Silicate
PO3^3-
Phosphite
PO4^3-
Phosphate
NH4^+
Ammonium