Identifying Negative Ions

Question 1

How do you know if it is an carbonate ion

Answer 1

1. Add HCl or HNO3
2. Bubbles
3. Turns limewater milky
4. It is CO3 2-

Question 2

How do you know if it is a chloride ion

Answer 2

1. Add HNO3
2. No bubbles
3. Add AgNO3
4. White precipitate then it is Cl-

Question 3

How do you know if it is a iodide ion

Answer 3

1. Add HNO3
2. No bubbles
3. Add AgNO3
4. Yellow precipitate then it is I-

Question 4

How do you know if it is a bromide ion

Answer 4

1. Add HNO3
2. No bubbles
3. Add AgNO3
4. Cream precipitate then it is Br-

Question 5

Gas test for hydrogen

Answer 5

A lot splint pops

Question 6

Test for oxygen

Answer 6

Relights a glowing splint

Question 7

Test for carbon dioxide

Answer 7

Turns limewater milky

Question 8

Gas test for ammonia

Answer 8

Turns damp litmus paper blue

Question 9

Gas test for chlorine

Answer 9

Green gas bleaches damp litmus paper

Question 10

How do you know if it is a sulphate ion

Answer 10

1. Add HCl or HNO3
2. If there are no bubbles then add BaCl2 or Ba(NO3)2
3. If a white precipitate forms then it is SO4 2-