Common Polyatomic Ions

Question 1

Acetate

Answer 1

C₂H₃O₂^-

or

CH₃COO^-

Question 2

Acetate

Answer 2

CH₃CO₂^-

Question 3

Ammonium

Answer 3

NH₄⁺

Question 4

Azide

Answer 4

N₃^-

Question 5

Carbonate

Answer 5

CO₃^2-

Question 6

Chlorate ion

Answer 6

ClO₃^-

Question 7

Chlorite ion

Answer 7

ClO₂^-

Question 8

Chromate

Answer 8

CrO₄^2-

Question 9

Cyanide ion

Answer 9

CN^-

Question 10

Dichromate

Answer 10

Cr₂O₇^2-

Question 11

Dihydrogen Phosphate

Answer 11

H₂PO₄^-

Question 12

Disulfide

Answer 12

S₂^2-

Question 13

Hydrogen Carbonate

(or bicarbonate ion)

Answer 13

HCO₃^-

Question 14

Hydrogen Phosphate ion

Answer 14

HPO₄^2-

Question 15

Hydrogen Sulfate

Answer 15

HSO₄^-

Question 16

Hydrogen Sulfate ion

(or bisulfate ion)

Answer 16

HSO₄^-

Question 17

Hydrogen Sulfite

Answer 17

HSO₃^-

Question 18

Hydronium

Answer 18

H₃O⁺

Question 19

Hydroxide ion

Answer 19

OH^-

Question 20

Hypochlorite

Answer 20

ClO^-

Question 21

Nitrate

Answer 21

NO₃^-

Question 22

Nitrite

Answer 22

NO₂^-

Question 23

Oxalate

Answer 23

C₂O₄^2-

Question 24

Perchlorate ion

Answer 24

ClO₄^-

Question 25

Permanganate

Answer 25

MnO₄^-

Question 26

Phosphate ion

Answer 26

PO₄^3-

Question 27

Phosphite

Answer 27

PO₃^3-

Question 28

Silicate

Answer 28

SiO₃^2-

Question 29

Sulfate ion

Answer 29

SO₄^2-

Question 30

Sulfite ion

Answer 30

SO₃^2-

Question 31

Thiocyanate

Answer 31

SCN^-