Qualitative analysis

Question 1

What ions are tested?

Answer 1

Cl-
Br-
I-
NH4-
SO4 2-
CO3 2-

Question 2

How do you test for a carbonate ion?

Answer 2

-Add a strong acid to your aqueous solution
-collect any gas and pass it through limewater

Question 3

What are the observations if carbonate ions are present?

Answer 3

-Fizzing
-Gas turns into cloudy limewater

Question 4

How do you test for sulphate ions?

Answer 4

-Add dilute HCl and barium chloride

Question 5

What are the observations if sulphate ions are present?

Answer 5

-White precipitate of barium sulphate is produced

Question 6

How do you test for a Halide ions?

Answer 6

-Add silver nitrate
-Add dilute NH3
-Add concentrated NH3

Question 7

List the order of observations of each halide:
Cl-
Br-
I-

Answer 7

Cl-= White precipitate, dissolved, dissolved
Br-= Cream precipitate, doesn’t dissolve, dissolves
I-= Yellow precipitate, Doesn’t dissolve, doesn’t dissolve

Question 8

How would you test for ammonium ions?

Answer 8

-Add sodium hydroxide to ammonium
-Warm gently
-Test with any gas involved with red litmus paper

Question 9

What are the observations if ammonium ions are present?

Answer 9

-Ammonium gas will turn litmus paper blue
-Ammonium gas has a distinct smell