Preparation of Lassaigne’s Solution- Detection of Elements in Organic Compound

Lassaigne’s Solution(Sodium Extract):

Lassaigne’s solution or sodium fusion extract should be prepared to detect Nitrogen, Sulphur and halogens in the given organic compound.

Materials Required:

Following is the list of materials required for the preparation of lassaigne’s solution.

  1. Sodium metal
  2. Distilled water
  3. Organic compound
  4. Test tube
  5. Fusion tube
  6. China dish
  7. Funnel
  8. Wire gauze
  9. Tripod stand’
  10. Filter paper
  11. Glass rod
  12. Bunsen burner

Procedure :

Step 1:

Take a small piece of dry sodium metal in a fusion tube.

Step 2:

Heat the fusion tube gently on the Bunsen burner to melt sodium metal.

Step 3:

Add a small amount of organic compound to a fusion tube.

Step 4:

Heat it first gently & then strongly the tube becomes red hot. 

Step 5:

Break this fusion tube into a china dish containing 20cm3 of distilled water.

Step 6:

Mix ,boil & filter the solution .

Step 7:

This filtrate is called Lassaigne’s solution or sodium extract

Then divide the filtrate (Lassaigne’s solution ) into three parts to test the presence of N, S & halogens.

It is based upon the fact that when an organic compound containing nitrogen, sulphur and halogen is strongly heated with metallic sodium, its nitrogen converts to ionic NaCN (sodium cyanide), sulphur to ionic NaS (sodium sulphide) and halogen to ionic NaX (sodium halide) if they are present.

Detection of elements in organic compounds -Preparation of Lassaigne solution ( Urdu / Hindi)

Continue Reading!!

Detection of Nitrogen in Organic Compound by Lassaigne’s Solution

Detection of Sulphur in Organic Compound by Lassaigne’s Solution

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

Detection of Nitrogen by Lassaigne’s Solution

How is Sulphur detected in Organic Compounds

Detection of Halogens in Organic Compounds by Lassaigne Method

Follow for more !!

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