EXPERIMENT_2_Jan_2010 - UNIVERSITI KUALA LUMPUR MALAYSIAN...

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UNIVERSITI KUALA LUMPUR MALAYSIAN INSTITUTE OF CHEMICAL Organic Chemistry CLD 10302 EXPERIMENT 2 RECRYSTALLIZATION OF BENZOIC ACID Name : UniKL I.D. No : Section : Group Member : Date :
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EXPERIMENT 2 RECRYSTALLIZATION OF BENZOIC ACID OBJECTIVE To purify benzoic acid by recrystallization To determine the melting point of pure benzoic acid INTRODUCTION The products of chemical reactions can be impure. Purification of your products must be performed to remove by-products and impurities. Liquids are customarily purified by distillation, while solids are purified by recrystallization (sometimes called simply " crystallization "). Recrystallization is a method of purifying a solid. There are two types of impurities: those more soluble in a given solvent than the main component and those less soluble. (If there are any impurities that have the same solubility as the main component, then a different solvent needs to be chosen.) When organic substances are synthesized in the laboratory or isolated from plants, they will obviously contain impurities. Several techniques for purifying these compounds have been developed. The most basic of these techniques for the purification of organic solids is recrystallization, which relies on the different solubilities of solutes in a solvent. Compounds, which are less soluble, will crystallize first. The crystallization process itself
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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_Jan_2010 - UNIVERSITI KUALA LUMPUR MALAYSIAN...

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