Detection of Halogens in Organic Compound – Lassaigne’s Solution – Silver Nitrate Test

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composition of organic compound

Detection of Halogens: (Silver Nitrate Test)

The following steps help in the detection of halogens in an organic compound.

Lassaigne’s test

Lasseigne’s solution or sodium fusion extract is used for preparation for the detection of nitrogen, sulphur and halogens in the given organic compound.


Step 1:

Take Lasseigne’s filtrate in a test tube and add a few drops of concentrated nitric acid (HNO3).

Step 2:

Boil  & then cool the solution.

Step 3:

Then add silver nitrate( AgNO3) solution.

presence of halogens in an organic compound

Presence of Chlorine:

If the organic compound contains chlorine then sodium chloride formed during the preparation of Lassaigne’s extract reacts with the silver nitrate to form a white precipitate of silver chloride.

chlorine presence in an organic compound

Chlorine Confirmatory Test:

Presence of Bromine:

Formation of pale yellow precipitate of silver bromide ( AgBr ).

Bromine presence in organic compound

Bromine Confirmatory Test:

Pale yellow precipitate partially soluble in NH4OH indicates the presence of bromide ions.

Presence of Iodine:

Iodine presence in organic compound

Iodine Confirmatory Test:

Deep yellow precipitate insoluble in NH4OH indicates the presence of iodide ions.

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