Testing For Anions

Question 1

How to test for SO4 2-

Answer 1

Add RED litmus
Litmus remains RED

Add Ba(NO3)2
White precipitate

(Others no precipitate)

Question 2

How to test for CO3 2-

Answer 2

Add red litmus paper
Litmus goes Blue

Add dilute HCL
Bubbles of gas

Question 3

How to test for OH-

Answer 3

Add red litmus paper
Litmus goes blue

Add dilute HCL
No bubbles

Question 4

How to test for NO3-

Answer 4

Add RED litmus
Litmus remains RED

Add Ba(NO3)2
No precipitate

New Sample
Add equal volumes HNO3 then AgNO3 (nitric acid and silver nitrate)
No precipitate

Question 5

How to test for Cl-

Answer 5

Add RED litmus
Litmus remains RED

Add Ba(NO3)2
No precipitate

New Sample
Add equal volumes HNO3 then AgNO3 (nitric acid and silver nitrate)
Precipitate white

Add dilute NH3 solution
Precipitate dissolves

Question 6

How to test for Br-

Answer 6

Add RED litmus
Litmus remains RED

Add Ba(NO3)2
No precipitate

New Sample
Add equal volumes HNO3 then AgNO3 (nitric acid and silver nitrate)
Precipitate creamy

Add dilute NH3 solution
Precipitate remains

Add concentrated NH3
Precipitate dissolves

Question 7

How to test for I-

Answer 7

Add RED litmus
Litmus remains RED

Add Ba(NO3)2
No precipitate

New Sample
Add equal volumes HNO3 then AgNO3 (nitric acid and silver nitrate)
Precipitate yellow

Add dilute NH3 solution
Precipitate remains

Add concentrated NH3
Precipitate remains

Question 8

How to test for Sulfite

Answer 8

Add dilute HCL, warm gently and test for the presence of sulfur dioxide