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Qualitative Tests - Organic

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Introduction

Sumeet Riar Qualitative Tests Organic AIM: Identify compound E and F (A) METHOD Transfer one quarter of E to an inverted crucible lid. Heat it gently from below to dry it, when white fumes begin to evolve ignite it from above. OBSERVATION The white fumes evolved in less then 1 minute of heating. When ignited a large flame arose. When flame was blown out initially black liquid formed followed by residue of soot around the lid. Once settled very small crystals could be observed. INFERENCE An aromatic compound or very highly saturated, also could be aliphatic. (B) METHOD Heat a little of E with water then filter if needed, separate the solution into two portions (i) ...read more.

Middle

A heated smell observed when sulphuric acid added. Some heat evolved and small crystals formed on heating After cooling the mixture effervescence was observed and a yellowish colour was observed INFERENCE Carboxylic group maybe present because when methanol and sulphuric acid react together an ester was formed. Carbon dioxide may been given of when sodium carbonate was added, according to the following reaction: CO32- + 2H+ --> CO2 + H2O (D) METHOD Place some of sample F on a inverted crucible lid and ignite it from above OBSERVATION No flame. Where ignited the powder turned yellow-brown colour INFERENCE Halogenated compound or hydroxo acid (E) METHOD Dissolve sample of F in 10cm3 of distilled water (i) ...read more.

Conclusion

To 2cm3 of the solution of F, add aqueous silver nitrate. Then add 1 cm3 of dilute nitric acid> Finally add an excess of aqueous ammonia OBSERVATION (i) F dissolves fully in water. The mixture turns slightly milky when sodium hydroxide is added. The mixture then becomes clear again when adding Hydrochloric acid (ii) No change observed initially however, the tube heated on adding hydrochloric acid to approximately 220C. When 2-naphtol added thick reddish, precipitate is formed. (iii) White precipitate formed on adding silver nitrate. The white precipitate remains after adding dilute nitric acid. The precipitate dissolved on adding aqueous ammonia. INFERENCE (i) Cannot be a phenol. Maybe a basic amine (ii) Nitrous is formed in situ. (Azo dye formed) or aromatic primary amine (iii) Cl - ion E - Phenol derivative F- aromatic primary amine with Cl attached to the benzene (Benzonediazonium chloride) ...read more.

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