how do you detect chlorine using sodium fusion extract?
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Lassaigne's test is carried out to detect presence of N,S,Halides(Cl,Br,I) in organic compounds. The basic protocol is to fuse organic compound with sodium metal in a glass tube. In this step Na reacts with C,N,S,Halides(Cl,Br,I) at fusion condition and later on comes in solution phase as we dissolve the fusion residue in water after crushing the fusion mass in a pestle mortar.
Na+C+N=NaCN
2Na+S=Na2S
Na+X=NaX(X=Cl,Br,I)
**Detection of Halides**
**Silver nitrate test**
During the preparation of Lassaigne's extract, chlorine, bromine and iodine form the organic compound if any reacts with sodium to form sodium chloride, sodium bromide and sodium iodide respectively. Sodium chloride gives a white precipitate of silver chloride with silver nitrate solution. The precipitate is soluble in ammonium hydroxide. For bromide the ppt is pale yellow and sparingly soluble in ammonia solution. For iodide ppt is yellow and insoluble in ammonia solution.
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