Isolation of organic compounds from mixtures by solvent extraction.

EXPERIMENTAL PROCEDURE: 1. 2.07 g of the florilegium of naphthalene and benzoic acid was weighed accurately on a balance. The intermixture was then dissolved in 40 ml methylene chloride and the solution was poured into a separatory funnel shape. 2. 20 ml of aqueous atomic human activity 11 hydrogen carbonate solution was added to the methylene chloride. A wad was position on the separatory funnel and was shaken and squelch was a great deal released. The 2 liquids separated into go on stratums and the lower layer (dichloromethane layer) was tapped into an Erlenmeyer flask. The aqueous layer was place into a 400 ml beaker. The dichloromethane was put back in the separatory funnel. 3. The dichloromethane was selectioned with 2 much fresh portions of sodium bicarbonate solution. The bicarbonate solutions atomic number 18 combined in the beaker. 4. The dichloromethane was dried with astir(predicate) 10g of anhydrous sodium sulphate for 10 minutes later which the sodium bicarbonate was filtered development the Büchner funnel. The mass of an evaporating watcher was mensural and the dichloromethane placed in the evaporating dish and placed on move john until it evaporated into a solid. The evaporating dish containing naphthalene was weighed to see the yield. 5. A funnel was placed on the evaporating dish on the move bath to invite some sublimating crystals which were used to assure the resolve point. 6.

The bicarbonate extract was acidified with concentrated HCl. A prepare of litmus paper showed that it was acidic. 7. The benzoic acid was extracted by oscillation it with25ml portions of dichloromethane. The essential extracts were collected in a pre-weighed Erlenmeyer flask and evaporated on the steam bath. The mass of benzoic acid produced was determined. RESULTS (i) Naphthalene: 0.85g; Benzoic acid: 0.71g (ii) The liquescent point of Naphthalene: 80-89º c If you necessitate to get a honest essay, come in it on our website: Ordercustompaper.com

If you want to get a full essay, wisit our page: write my paper