Isolation of organic compounds from mixtures by solvent extraction.
Date Submitted: 09/10/2006 02:16:29
Category: / Society & Culture / Art and Culture
Length: 1 pages (281 words)
Category: / Society & Culture / Art and Culture
Length: 1 pages (281 words)
EXPERIMENTAL PROCEDURE:
1. 2.07 g of the mixture of naphthalene and benzoic acid was weighed accurately on a balance. The mixture was then dissolved in 40 ml dichloromethane and the solution was poured into a separatory funnel.
2. 20 ml of aqueous sodium bicarbonate solution was added to the dichloromethane. A stopper was placed on the separatory funnel and was shaken and pressure was frequently released. The 2 liquids separated into clear layers and the lower layer (dichloromethane layer) was tapped …
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…melting point.
6. The bicarbonate extract was acidified with concentrated HCl. A piece of litmus paper showed that it was acidic.
7. The benzoic acid was extracted by shaking it with25ml portions of dichloromethane. The organic 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 melting point of Naphthalene: 80-89º c
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