SC CHEM 333 - Chemical Extraction Pre-Lab (8 pages)

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Chemical Extraction Pre-Lab



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Organic Chemistry 333L section 03M Laboratory Pre Lab Chemical Extraction By Cameron Kahn 14 January 2019 TA James Collie 1 Objectives The chemical extraction lab experiments objective is to separate the components of a ternary mixture by a chemical extraction procedure CITATION Geo12 l 1033 This experiment calls for the recrystallization of each component and record the melting point and percent recovered Also find the exact mixture composition for each unknown and calculate the percent composition of each component Theory Over the centuries humans have carried out solid liquid extraction by brewing just about every common plant leaf fruit or root In the process they have isolated a number of extracts with pharmacological activity Many of these compounds were used for medicinal purposes For example Sertuner first extracted morphine from poppy seeds in 1805 Sertuner and several derivatives such as codeine are used as painkillers today Unfortunately other derivatives such as heroine have become drugs of abuse Figure 1 Morphine Codeine and Heroini While solid liquid extraction is the most common technique used to brew beverages and isolate natural products liquid liquid extraction is a very common method used in the organic laboratory Organic reactions often yield a number of by products some inorganic some organic Also since they do not go to 100 completion some starting material is also often present at the end of an organic reaction The real work in organic chemistry is not running the reaction but rather in what is appropriately called the work up of the reaction mixture that is the separation and purification of the desired product from the mixture of by products and residual starting material Liquid liquid extraction is often used as the initial step in the work up of a reaction meaning liquid liquid extraction is done before final purification of the product by recrystallization distillation or sublimation A concrete example will help make sense of this One of



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