Experiment 2 Organic Chemistry - Organic Chemistry CLD...

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Organic Chemistry CLD 10302 EXPERIMENT 2 RECRYSTALLIZATION OF BENZOIC ACID LECTURER : MDM. NOR AINI BT. BUROK NAME: MOHD HELMI BIN JAMAL ABD NASIR 55101210105 MOHAMAD KHAIDIR BIN HAMZAH 55121010076 SYAHRUL IZWAN BIN ISMAIL 55101210142
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SECTION: 2 DIP B Objective(s) To purify benzoic acid by recrystallization To determine the melting point of pure benzoic acid Materials and Methods Materials Chemicals: Benzoic Acid Distilled Water Apparatus: Conical Flasks Filter funnel Hirsch/Buchner funnel Watch Glass Capillary Tubes Beaker Methods Part A 1.0 g of Benzoic Acid was weighed and poured into a 100 ml conical flask. 15 ml of water and an anti-bumping granules (3-5 pieces) was recently added. The mixture was heated on a hot plate until the solvent boils up. Successive small volume of water was added until the boiling continued and all the benzoic acid has dissolve. The fluted filter paper was prepared and then it was put in the funnel. Then it was put in the oven until it was ready to be used.
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20 ml of water was heated in a beaker then the hot mixture was filtered through a fluted filter into a conical flask. The remaining solution was kept hot throughout the filtration process if it was done in batches. Furthermore a small volume of boiling water was added if the crystallization occurs on the filter paper to allowed the solution flow through the funnel. A small volume of hot solvent was added until all the crystal was dissolved. The filtrate was boiled to produce a more concentrated solution after the filtration. The conical flask was covered with a watch glass and the solution was allowed to cool to room temperature, then In an ice-bath after crystallization has occurred. If there were no crystallization happened, the solution will be heated. The flask was rinsed with some filtrate after all the benzoic crystal was filtered
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This note was uploaded on 05/08/2011 for the course ACCOUNTING 121210 taught by Professor Sdasdas during the Spring '10 term at Albany College of Pharmacy and Health Sciences.

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Experiment 2 Organic Chemistry - Organic Chemistry CLD...

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