Answer to Question #255572 in Inorganic Chemistry for lily

Question

How would you detect the presence of Chloride, Bromide and Iodide in presence of each other?

Answer 1

The salt containing the Chloride, Bromide or Iodide ions is first mixed with about thrice the amount of Na2CO3 and 10–15 ml.of distilled water is added and then boiled well for some time and then cooled. The reaction mixture is filtered.

1. A portion of this filtrate is acidified with a few drops of dilute. nitric acid and then about 1 ml.of 10% AgNO3 solution is added.
2. Formation of a white prepitate indicates the presence of a ‘CHLORIDE' ion. If it completely dissolves in strong NH4OH solution, then the presence of 'CHLORIDE' is confirmed.
3. If a pale yellow precipitate is formed, it indicates the presence of a 'BROMIDE' ion. It is only partially soluble in strong NH4OH solution confirms the presence of 'BROMIDE' ion.
4. If a yellow precipitate is formed, which is completely INSOLUBLE in NH4OH, confirms the presence of an 'IODIDE' ion.