Anions

Question 1

SO4 2-

Answer 1

Sulfate ions in solution, SO42-, are detected using barium chloride solution. The test solution is acidified using a few drops of dilute HCl (remove co3 ions), and then a few drops of BaCl2 solution are added. A white precipitate of barium sulfate forms if sulfate ions are present.

Question 2

CO3 -

Answer 2

An acid, such as dilute hydrochloric acid, is added to the test compound.
Carbon dioxide gas bubbles if carbonate ions are present. Limewater is used to confirm that the gas is carbon dioxide. It turns from clear to milky when carbon dioxide is bubbled through.

Question 3

Cl-

Answer 3

The test solution is acidified using a few drops of dilute nitric acid, and then a few drops of silver nitrate solution are added. White ppt will form indicating the presence of silver chloride.

Question 4

Br-

Answer 4

The test solution is acidified using a few drops of dilute nitric acid, and then a few drops of silver nitrate solution are added. Cream Ppt will form indicating the presence of Silver Bromide.

Question 5

I-

Answer 5

The test solution is acidified using a few drops of dilute nitric acid, and then a few drops of silver nitrate solution are added. Yellow ppt sill form indicating the presence of silver iodide

Question 6

NO3-

Answer 6

Add sodium hydroxide solution, then aluminium powder or foil
heating strongly
If nitrate ions are present, ammonia gas is given off. This has a characteristic choking smell. It turns red litmus paper blue.