Anion Tests

Question 0

Chloride in solution [Cl-]

Answer 0

Acidify solution with dilute nitric acid, then add AQ silver nitrate.

White precipitate of silver chloride formed: precipitate soluble in ammonia solution.

Question 1

Carbonate CO3 2-

Answer 1

Add to dilute hydrochloric acid to solid. Effervescents [fizzes], carbon dioxide produced

Question 2

Bromide in solution [Br-]

Answer 2

Acidify solution with dilute nitric acid, then add aq silver nitrate

Cream precipitate of silver bromide form: only slightly soluble in ammonia solution

Question 3

Iodide [I-] [in solution]

Answer 3

Acidify solution with dilute nitric acid, then add aq silver nitrate

Yellow precipitate of silver iodide formed: insoluble in ammonia solution

or acidify solution with dilute nitric acid, then ad lead nitrate solution

Yellow precipitate of lead iodide formed

Question 4

Nitrate (No3 -) in solution

Answer 4

Make alkaline with sodium hydroxide solution, then add aluminium foil and warm carefully

Ammonium gas given off [test with moist red litmus]

Question 5

Sulfate in solution [SO4 2-]

Answer 5

Acidify solution with dilute nitric acid, then add barium nitrate solution

White precipitate of barium sulfate formed