QA - Test for Anions

Question 1

CO32-

Answer 1

Add dilute HNO3 (aq) to 1 cm3 of the unknown.
CO2 evolved (Do CO2 test)

Question 2

Cl-

Answer 2

Add dilute HNO3 (aq), followed by AgNO3 (aq) solution.
White precipitate was formed.

Question 3

I-

Answer 3

Add dilute HNO3 (aq), followed by AgNO3 (aq) solution.
Yellow precipitate was formed

Question 4

SO42-

Answer 4

Add dilute HNO3 (aq) followed by Ba(NO3)2 (aq) or BaCl2 (aq) solution.
White precipitate was formed.

Question 5

NO3-

Answer 5

Add NaOH (aq) followed by Al powder/foil. Warm carefully.
NH3 gas evolved. (NH3 test)