Common Polyatomic Ions

Question 1

Ammonium

Answer 1

NH₄⁺

Question 2

Nitrite

Answer 2

NO₂^–

Question 3

Nitrate

Answer 3

NO₃^–

Question 4

Sulfite

Answer 4

SO₃^2–

Question 5

Sulfate

Answer 5

SO₄^2–

Question 6

Hydrogen Sulfate (aka bisulfate)

Answer 6

HSO₄^–

Question 7

Hydroxide

Answer 7

OH^–

Question 8

Cyanide

Answer 8

CN^–

Question 9

Phosphate

Answer 9

PO₄^3–

Question 10

Hydrogen Phosphate

Answer 10

HPO₄^2–

Question 11

Dihydrogen Phosphate

Answer 11

H₂PO₄^–

Question 12

Carbonate

Answer 12

CO₃^2–

Question 13

Hydrogen Carbonate (aka bicarbonate)

Answer 13

HCO₃^–

Question 14

Hypochlorite

Answer 14

ClO^–

Question 15

Chlorite

Answer 15

ClO₂^–

Question 16

Chlorate

Answer 16

ClO₃^–

Question 17

Perchlorate

Answer 17

ClO₄^–

Question 18

Acetate

Answer 18

C₂H₃O₂^–

Question 19

Permanganate

Answer 19

MnO₄^–

Question 20

Dichromate

Answer 20

Cr₂O₇^2–

Question 21

Chromate

Answer 21

CrO₄^2–

Question 22

Peroxide

Answer 22

O₂^2–