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because of its electropositive nature. it is cheap also. although potassium can be used but it is costly... and lithium is less electropositive...

Lassaigne's test is a test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. In order to detect them, these have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be detected by simple chemical tests. The extract is called sodium fusion extract or Lassaigne's extract.

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Q: Why only sodium is used in Lassaigne's test?
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Why sodium metal is used in lassaignes test?

The compounds of sodium are soluble that is why it is used.


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Prussian test is a part of lassaigne test, since prussain test used for nitrogen detection while lassaigne used for detection of halogens sulphur and nitrogen in organic compounds


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When an organic compound is heated strongly with sodium, any halogens, nitrogen, and sulfur will be converted into inorganic sodium salts such as sodium halide (for halides), sodium cyanide(for nitrogen), sodium sulfide (for sulfur), and sodium thiocyanate (for sulfur and nitrogen).The nitrogen is confirmed with ferrous sulfate i.e. iron sulfate.


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