Tests for anions (-)

Question 1

Carbonate (CO3^2-)

Answer 1

• Add dilute acid.

- Effervescence, carbon dioxide is produced.

Question 2

Chloride (Cl-) in solution

Answer 2

• Acidify with dilute nitric acid, then add aqueous silver nitrate.
• White PPT

Question 3

Iodide (I-) in solution

Answer 3

• Acidify with dilute nitric acid, then add aqueous silver nitrate.
• Yellow PPT

Question 4

Nitrate (NO3-) in solution

Answer 4

• Add aqueous sodium hydroxide then aluminium foil. Warm carefully.
• Ammonia is produced

Question 5

Sulphate (SO3^2-) in solution

Answer 5

• Acidify with dilute nitric acid, then add aqueous barium nitrate.
• White PPT