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polyatomic ions
Acetate
C2H3O2 1-
Chloroate
ClO₃⁻
Hydroxide
OH-
Nitrate
NO3 1-
Nitrite
NO2 1-
Carbonate
CO3 2-
Sulfate
SO4 2-
Sulfite
SO3 2-
phosphate
PO4 3-
Ammonium
NH4 1+