Common Polyatomic Ions

 

 

 

ammonium

 

 

 

NH4+

 

 

 

nitrite

 

 

 

NO2

 

 

 

nitrate

 

 

 

NO3

 

 

 

sulfite

 

 

 

SO32-

 

 

 

sulfate

 

 

 

SO42-

 

 

 

hydrogen sulfate

(aka bisulfate)

 

 

 

HSO4

 

 

 

hydroxide

 

 

 

OH

 

 

 

cyanide

 

 

 

CN

 

 

 

phosphate

 

 

 

PO43-

 

 

 

hydrogen phosphate

 

 

 

HPO42-

 

 

 

dihydrogen phosphate

 

 

 

H2PO4

 

 

 

carbonate

 

 

 

CO32-

 

 

 

hydrogen carbonate

(aka bicarbonate)

 

 

 

HCO3

 

 

 

hypochlorite

 

 

 

ClO

 

 

 

chlorite

 

 

ClO2

 

 

 

chlorate

 

 

 

ClO3

 

 

 

perchlorate

 

 

 

ClO4

 

 

 

acetate

 

 

 

C2H3O2

 

 

 

permanganate

 

 

 

MnO4

 

 

 

dichromate

 

 

 

Cr2O72-

 

 

 

chromate

 

 

 

CrO42-

 

 

 

peroxide

 

 

 

O22-

 

 

 

oxalate

 

 

 

C2O42-

 

 

 

silicate

 

 

 

SiO32-

 

 

 

phosphite

 

 

 

PO33-

 

 

 

benzoate

 

 

 

C7H5O2

 

 

 

hydronium

 

 

 

H3O+

 

 

 

mercury (I)

 

 

 

Hg22+

 

 

 

tropylium

 

 

 

C7H7+

 

 

 

arsenate

 

 

AsO43-

 

 

 

azide

 

 

 

N3

 

 

 

borate

 

 

 

BO33-

 

 

 

bromate

 

 

 

BrO3

x

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