AP Chemistry Memorization: Common Polyatomic Ions

Dihydrogen Phosphate

H₂PO₄^1-

Hydrogen Sulfite

HSO₃^1-

Hydrogen Sulfate

HSO₄^1-

Hydrogen Carbonate

HCO₃^1-

Acetate

C₂H₃O₂^1-

Bromate

BrO₃^1-

Iodate

IO₃^1-

Nitrite

NO₂^1-

Nitrate

NO₃^1-

Permanganate

MnO₄^1-

Hypochlorite

ClO^1-

Chlorite

ClO₂^1-

Chlorate

ClO₃^1-

Perchlorate

ClO₄^1-

Cyanide

CN^1-

Hydroxide

OH^1-

Hydrogen Phosphate

HPO₄^2-

Sulfite

SO₃^2-

Sulfate

SO₄^2-

Carbonate

CO₃^2-

Oxalate

C₂O_4^2-

Chromate

CrO₄^2-

Dichromate

Cr₂O₇^2-

Silicate

SiO₃^2-

Phosphite

PO₃^3-

Phosphate

PO₄^3-

Ammonium

NH₄¹⁺

Bicarbonate

HCO₃ ^1-