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acetate
CH3COO-
carbonate
CO3 2-
chromate
CrO4 2-
cyanide
CN-
dichromate
Cr2O72-
hydrogen carbonate
HCO3-
hydroxide
OH-
Nitrate
NO3-
Nitrite
NO2-
permaganate
MnO4-
phosphate
PO43-
sulfate
SO42-
sulfite
SO32-
ammonium
NH4+
hydronium
H3O+