AP Chemistry Common Polyatomic Ions

H₂PO₄^-

H₂PO₄^-

dihydrogen phosphate

CH₃COO^-

acetate

HSO₃^-

hydrogen sulfite (bisulfite)

HSO₄^-

hydrogen sulfate (bisulfate)

HCO₃^-

hydrogen carbonate (bicarbonate)

NO₂^-

nitrite

NO₃^-

nitrate

CN^-

cyanide

CNO^-

cyanate

CNS^-

thiocyanate

OH^-

hydroxide

MnO₄^-

permanganate

ClO^-

hypochlorite

ClO₂^-

chlorite

ClO₃^-

chlorate

ClO₄^-

perchlorate

HPO₄^2-

hydrogen phosphate

C₂O₄^2-

oxalate

SO₃^2-

sulfite

SO₄^2-

sulfate

CO₃^2-

carbonate

S₂O₃^2-

thiosulfate

CrO₄^2-

chromate

Cr₂O₇^2-

dichromate

SiO₃^2-

silicate

O₂^2-

peroxide

PO₃^3-

phosphite

PO₄^3-

phosphate

NH₄⁺

ammonium

BrO₃^-

bromate

IO₃^-

iodate

O₂^-

superoxide

H₃O⁺

Hydronium

Hg₂²⁺

Mercury I

MoO₄^2-

Molybdate

AsO₄^3-

Arsenate