Important polyatomic ions

Hydronium

H3O+

Mercury(I)

Hg2+2

Ammonium

NH4+

Acetate

C2H3O2-

Hypochlorite

ClO-

Chlorite

ClO2-

Chlorate

ClO3-

Perchlorate

ClO4-

Cyanide

CN-

Hydrogen Carbonate

HCO3-

Dihydrogen Phosphate

H2PO4-

Hydrogen Sulfite

HSO3-

Hydrogen Sulfate

HSO4-

Permanganate

MnO4-

Nitrite

NO2-

Nitrate

NO3-

Hydroxide

OH-

Thiocyanate

SCN-

Carbonate

CO3-2

Oxalate

C2O4-2

Chromate

CrO4-2

Dichromate

Cr2O7-2

Hydrogen Phosphate

HPO4-2

Selenate

SeO4-2

Silicate

SiO3-2

Sulfite

SO3-2

Sulfate

SO4-2

Thiosulfate

S2O3-2

Arsenate

AsO4-3

Borate

BO3-3

Phosphite

PO3-3

Phosphate

PO4-3

Acetic Acid

HC2H3O2

Hydrochloric Acid

HCl

Nitric Acid

HNO3

Carbonic Acid

H2CO3

Sulfuric Acid

H2SO4

Phosphoric Acid

H3PO4