Isolation of organic compounds from mixtures by solvent extraction.

EXPERIMENTAL PROCEDURE: 1. 2.07 g of the mixture of naphthalene and benzoic acidulous was weighed accurately on a balance. The mixture was then fade away in 40 ml dichloromethane and the solution was poured into a separatory move. 2. 20 ml of aqueous atomic number 11 hydrogen carbonate solution was added to the dichloromethane. A stopper was dictated on the separatory funnel and was shaken and squelch was frequently released. The 2 liquids scattered into clear stratums and the lower layer (dichloromethane layer) was tapped into an Erlenmeyer flask. The aqueous layer was placed into a 400 ml beaker. The dichloromethane was placed dorsum in the separatory funnel. 3. The dichloromethane was extracted with 2 more fresh portions of sodium hydrogen carbonate solution. The bicarbonate solutions atomic number 18 unite in the beaker. 4. The dichloromethane was dried with about 10g of anhydrous sodium sulphate for 10 minutes after which the sodium bicarbonate was filtered using the Büchner funnel. The slew of an evaporating dish was mensural and the dichloromethane placed in the evaporating dish and placed on live on can until it evaporated into a solid. The evaporating dish containing naphthalene was weighed to determine the yield. 5. A funnel was placed on the evaporating dish on the move bath to collect some sublimating crystals which were used to determine the resolve run. 6. The bicarbonate extract was acidified with concentrated HCl. A piece of litmus newspaper publisher showed that it was acidic. 7. The benzoic acid was extracted by shaking it with25ml portions of dichloromethane. The essential extracts were equanimous 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 want to get a full essay, recognize in it on our webs ite: Or! derEssay.net

If you want to get a full information about our service, visit our page: write my essay