2.8 Polyatomic ions and Compounds

Question 1

What are the different ways of writing a cation?

Answer 1

1. Cations formed from metal Adams have the same name as the metal.
   Na+ sodium ion
   Zn^2+ zinc ion
   Al^3+ aluminum ion
2. If a metal can form cat ions with different charges, the positive charge is indicated by a in parentheses following the name of the metal.

Fe^2+ = iron(II) ion 
Cu+ = copper(I) ion

Question 2

Ammonium ion

Answer 2

NH4+

Question 3

Acetate ion

Answer 3

C H O-

² ³ ²

Question 4

Carbonate ion

Answer 4

CO²-

³

Question 5

Chlorate ion

Answer 5

ClO -

³

Question 6

Chlorite ion

Answer 6

ClO -

²

Question 7

Chromate ion

Answer 7

CrO ²-

4

Question 8

Cyanide ion

Answer 8

CN-

Question 9

Dichromate ion

Answer 9

Cr O²-

2 7

Question 10

Hydrogen carbonate ion

Answer 10

HCO -

³

Question 11

Hydrogen sulfate ion

Answer 11

HSO -

4

Question 12

Hydroxide ion

Answer 12

OH-

Question 13

Hypochlorite ion

Answer 13

ClO-

Question 14

Nitrate ion

Answer 14

NO -

³

Question 15

Nitrite ion

Answer 15

NO -

²

Question 16

Perchlorate ion

Answer 16

ClO -

4

Question 17

Permanganate ion

Answer 17

MnO -

4

Question 18

Phosphate ion

Answer 18

PO ³-

4

Question 19

Sulfate ion

Answer 19

SO ²-

4

Question 20

Sulfite ion

Answer 20

SO ²-

³