Isolation of organic compounds from mixtures by solvent extraction.

EXPERIMENTAL PROCEDURE: 1. 2.07 g of the change of naphthalene and benzoic irate was weighed accurately on a balance. The mixing was then dissolved in 40 ml methylene chloride and the solution was poured into a separatory displace. 2. 20 ml of sedimentary nu kick the bucket public figure 11 hydrogen carbonate solution was added to the methylene chloride. A stopper was located on the separatory funnel and was shaken and squelch was ofttimes released. The 2 liquids separated into clear stratums and the lower layer (dichloromethane layer) was tapped into an Erlenmeyer flask. The aqueous layer was hardened into a 400 ml beaker. The dichloromethane was located back in the separatory funnel. 3. The dichloromethane was forceed with 2 to a greater extent fresh portions of sodium bicarbonate solution. The bicarbonate solutions atomic number 18 combined in the beaker. 4. The dichloromethane was dried with slightly 10g of anhydrous sodium sulfate for 10 minutes by and by which the sodium bicarbonate was filtered apply the Büchner funnel. The mass of an evaporating dish out was mensural and the dichloromethane placed in the evaporating dish and placed on move tub until it evaporated into a solid. The evaporating dish containing naphthalene was weighed to run into the yield. 5. A funnel was placed on the evaporating dish on the move bath to clear some sublimating crystals which were used to set apart the resolve point. 6.

The bicarbonate extract was acidified with concentrated HCl. A tour of litmus paper showed that it was acidic. 7. The benzoic acid was extracted by shake 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 destiny to get a effective essay, come in it on our website: Orderessay

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