Common Polyatomics and Oxoanions

Chem 104

Ammonium

NH₄^-

Mercury (I)

Hg₂ ²⁺

Hydronium

H₃O ⁺

Phosphonium

PH₄ ⁺

Peroxide

O₂ ^2-

Hydroxide

OH ^-

Azide

N₃ ^-

Acetate

C₂H₃O₂ - or Ch₃CoO ^-

Oxalate

C₂O₄ ^2-

Chromate

CrO₄ ^2-

Dichromate

Cr₂O₇ ^2-

Permanganate

MnO₄ ^-

Carbonate

CO₃ ^2-

Nitrite

NO ^2-

Nitrate

NO₃ ^-

Phosphate

PO₄ ^3-

Sulfite

SO₃ ^2-

Sulfate

SO₄ ^2-

Hypochlorite

ClO ^-

Chlorite

ClO₂ ^-

Chlorate

ClO₃ ^-

Perchlorate

ClO₄ ^-

Bromate

BrO₃ ^-

Iodate

IO₃ ^-

Borate

BO₃ ^3-

Cyanide

CN^-

Cyanate

OCN ^-

Thiocyanate

SCN ^-

Hydrogen Carbonate or Bicarbonate

HCO₃ ^-

Monohydrogen phosphate

HPO₄ ^2-

Hydrogen sulfite or Bisulfite

HSO₃ ^-

Hydrogen sulfate or Bisulfate

HSO₄ ^-

Carbonate Ion

CO₃ ^2-

Nitrite Ion

NO₂ ^-

Nitrate Ion

NO₃ ^-

Phosphate Ion

PO₄ ^3-

Sulfite Ion

SO₃ ^2-

Sulfate Ion

SO₄ ^2-

Hypochlorite Ion

ClO^-

Chlorite Ion

ClO₂ ^-

Chlorate Ion

ClO₃ ^-

Perchlorate Ion

ClO₄ ^-

Cyanide Ion

CN ^-

Carbonic Acid

H₂CO₃

Nitrous Acid

HNO₂

Nitric Acid

HNO₃

Phosphoric Acid

H₃PO₄

Sulfurous Acid

H₂SO₃

Sulfuric Acid

H₂SO₄

Hypochlorous Acid

HClO

Chlorous Acid

HClO₂

Chloric Acid

HClO₃

Perchloric Acid

HClO₄

Hydrocyanic Acid

HCN