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Polyatomic Ions
cyanide
CN−
hydroxide
OH−
bicarbonate
HCO3 −
carbonate
CO3 2 −
chlorate
ClO3 −
nitrate
NO3 −
ammonium
NH4 +
sulfate
SO4 2 −
phosphate
PO4 3 −
acetate
C2H3O2 −