Question

how is nitrogen detected in lassaigne filterate?​

Answer 1

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Nitrogen is covalently bonded to the organic compound. Upon fusion with sodium metal, the covalently bonded nitrogen is converted to ionic sodium cyanide, which can be extracted by boiling the fused mass with distilled water and is used for the detection of nitrogen.

Answer 2

Explanation:

Real Lab Procedure

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

Heat the tube slightly on a Bunsen burner so that the sodium melts to a shining globule.

Add a pinch of the organic compound.

Heat it slowly to start with so that the compound reacts with sodium metal.

Now heat the tube strongly till it becomes red hot.

Plunge the red hot tube into a china dish containing distilled water.

Crush the contents with a glass rod and heat to boiling point.

Stop heating and remove the insoluble matter by filtration.

The filtrate is called Lassaigne's Extract.

Detection of Nitrogen

Materials Required

Real Lab Procedure

Experiment Observation Inference

To a small portion of the Lassaigne’s extract, add 2 ml of freshly prepared ferrous sulphate solution and heat. Now add 2-3 drops of ferric chloride solution and acidify with conc. hydrochloric acid . Appearance of a prussian blue coloration Presence of Nitrogen in the compound