Ch. VI - Anion tests

Question 1

To test for the presence of chloride ions.

Answer 1

Add silver nitrate. Clear to white precipitate. Add NH3. White precipitate disappears.

Question 2

To test for the presence of sulfate and sulfite ions.

Answer 2

Add BaCl2. Clear to white precipitate. Add HCl. Cloudy precipitate remains in sulfate (BaSO4). Cloudy precipitate disappears in sulfite (BaSO3).

Question 3

To test for the presence of carbonate and hydrogen carbonate ions.

Answer 3

Add HCl. Effervescence is produced. Add MgSO4. Cloudy precipitate forms in carbonate. Cloudy precipitate doesn’t form in hydrogen carbonate.

Question 4

To test for the presence of nitrate (NO3-) ions.

Answer 4

Add iron(II) sulfate. Slowly add H2SO4 using a dropper. A brown ring is formed.

Question 5

To test for the presence of phosphate ions.

Answer 5

Add ammonium molybdate. Slowly add nitric acid(HNO3) using a dropper. Place in a warm water bath. A yellow precipitate is formed.