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Discussion and conclusion-1

Discussion and conclusion-1 - Marta Gebregziabher...

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Marta Gebregziabher Discussion and conclusion : Extraction and Recrystallization 1. Extraction is used when the desired compound is a part of a mixture. Extraction relays on a process called partitioning, which is a method that uses the solubility's of the substances that are in the mixture. Another method to extract desired substances from a mixture is by adsorption. Adsorption is the adhesion of liquid or solid molecules to a solid surface. Both adsorption and partitioning result in phase distribution, which is the separation of compounds into two phases. Liquid-liquid extraction is the most common method of extracting an organic compound from a mixture. This experiment involved the solute, A, the extracting phase, Sx, and the original phase, So. In order for the solute, A, to be extracted, the extraction solvent, Sx, has to meet specific criteria’s. a. Sx and So have to be solvents that do not mix or immiscible. If they are immiscible A cannot be extracted. b. Sx cannot irreversibly react with the compound of interest or A. The reaction has to be easily reversible. c. Sx has to be specific for A because this will give a high yield. d. Sx has to be easily removed. This means that Sx has to have a low Boiling point. If the solute, A, and the extraction solvent, Sx, don’t mix, then the experiment has to be changed so that the solubility character is changed and it becomes more soluble. Some methods that change the solubility of a compound are pH, temperature, pressure, volume, and ionic composition. One method that can be controlled in a regular lab is the pH.
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