Detection of Halogens
In Orgainic Compound
Materials Required
Real Lab Procedure
| Test | Experiment | Observation | Inference |
|---|---|---|---|
| Silver nitrate Test | To a small portion of Lassaigne's extract add 1 ml of conc. nitric acid and boil for some time. Cool the contents and to it add silver nitrate solution. | A white precipitate soluble in ammonium hydroxide forms. | Presence of chlorine in the compound. |
| Pale yellow precipitate sparingly soluble in ammonium hydroxide forms. | Presence of bromine in compound. | ||
| Yellow precipitate insoluble in ammonium hydroxide forms. | Presence of iodine in compound. | ||
| Carbon disulphide Test | Acidify a small portion of Lassaigne's extracts with dil. HCl and add a few drops of carbon disulphide. Now add freshly prepared chlorine water and shake vigorously. | Appearance of orange colour in the carbon disulphide layer. | Presence of bromine in compound. |
| Appearance of violet colour in the carbon disulphide layer. | Presence of iodine in compound. |
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