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Word Count: 274
EXPERIMENTAL PROCEDURE 1 207 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 into an Erlenmeyer flask The aqueous layer was placed into a 400 ml beaker The dichloromethane was placed back in the separatory funnel 3 The dichloromethane was extracted with 2 more fresh portions of sodium bicarbonate solution The bicarbonate solutions are combined 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 B funnel The mass of an evaporating dish was measured and the dichloromethane placed in the evaporating dish and placed on steam bath 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 steam bath to collect some sublimating crystals which were used to determine the 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 085g Benzoic acid 071g ii The melting point of Naphthalene 80-89 c
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