Common Polyatomic Ions acetate ammonium arsenate arsenite azide benzoate borate bromate carbonate chlorate chlorite chromate cyanide dichromate dihydrogen phosphate dihydrogen phosphite hydrogen carbonate hydrogen phosphate hydrogen phosphite hydrogen sulfate hydrogen sulfide hydrogen sulfite hydroxide hypochlorite iodate manganate nitrate nitrite oxalate perchlorate permanganate peroxide phosphate phosphite silicate sulfate sulfite tartrate thiocyanate thiosulfate C2H3O2⎯ NH4+ AsO43 ⎯ AsO33 ⎯ N3⎯ C7H5O2⎯ BO33 ⎯ BrO3⎯ CO32 ⎯ ClO3⎯ ClO2⎯ CrO42 ⎯ CN ⎯ Cr2O72 ⎯ H2PO4⎯ H2PO3⎯ HCO3⎯ HPO42 ⎯ HPO32 ⎯ HSO4⎯ HS ⎯ HSO3⎯ OH ⎯ ClO ⎯ IO3⎯ MnO42 ⎯ NO3⎯ NO2⎯ C2O42 ⎯ ClO4⎯ MnO4⎯ O22 ⎯ PO43 ⎯ PO33 ⎯ SiO32 ⎯ SO42 ⎯ SO32 ⎯ C4H4O62 ⎯ SCN ⎯ S2O32 ⎯ AsO33 ⎯ AsO43 ⎯ BO33 ⎯ BrO3⎯ C2H3O2⎯ C2O42 ⎯ C4H4O62 ⎯ C7H5O2⎯ ClO ⎯ ClO2⎯ ClO3⎯ ClO4⎯ CN ⎯ CO32 ⎯ Cr2O72 ⎯ CrO42 ⎯ H2PO3⎯ H2PO4⎯ HCO3⎯ HPO32 ⎯ HPO42 ⎯ HS ⎯ HSO3⎯ HSO4⎯ IO3⎯ MnO4⎯ MnO42 ⎯ N3⎯ NH4+ NO2⎯ NO3⎯ O22 ⎯ OH ⎯ PO33 ⎯ PO43 ⎯ S2O32 ⎯ SCN ⎯ SiO32 ⎯ SO32 ⎯ SO42 ⎯ arsenite arsenate borate bromate acetate oxalate tartrate benzoate hypochlorite chlorite chlorate perchlorate cyanide carbonate dichromate chromate dihydrogen phosphite dihydrogen phosphate hydrogen carbonate hydrogen phosphite hydrogen phosphate hydrogen sulfide hydrogen sulfite hydrogen sulfate iodate permanganate manganate azide ammonium nitrite nitrate peroxide hydroxide phosphite phosphate thiosulfate thiocyanate silicate sulfite sulfate