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Separation of a Mixture by Extraction: Crystallization

Objectives. Separation of a mixture containing an acidic and a neutral compounds by extraction.Purification of the solid component by crystallization.Identify those components from its IR spectrum and its melting point.. Terms. SeparationExtractionCrystallization. Separation. Why we need to sepa

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Separation of a Mixture by Extraction: Crystallization

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    1. Separation of a Mixture by Extraction: Crystallization

    2. Objectives Separation of a mixture containing an acidic and a neutral compounds by extraction. Purification of the solid component by crystallization. Identify those components from its IR spectrum and its melting point.

    3. Terms Separation Extraction Crystallization

    4. Separation Why we need to separate mixture?? To isolate or concentrate components from a mixture. To separate a components from other species that would interfere in the analysis

    5. Methods of Separation Extraction Crystallization Distillation Chromatography

    6. Extraction Extraction: Transfer of a solute from one phase to another.

    7. Types of Extraction Can use most any combination of phases (solid, liquid, gas, supercritical fluid). Solid Liquid - Useful for the isolation and purification of naturally occurring sources.

    8. Extraction Making coffee is an example for extraction.

    9. Extraction Liquid Liquid - More common method - Depend on solubility properties of components. Like dissolves like - So ideally, the extracting solvent should be similar to the solute.

    10. Extraction We will use two immiscible liquids. - Typically aqueous / organic solvent combos

    11. Extraction Organic solvents less dense than water. - Diethyl ether, Toluene, Hexane Organic solvents more dense than water. - Dichloromethane, Chloroform and Carbon tetrachloride.

    12. Qualities of the Solvent Immiscible with other solvent. It should readily dissolve the compound to be extracted. It should dissolve little or none of the unwanted compounds / impurities. Easily separated from the compound. Should not undergo any reaction with the compounds.

    13. Extraction

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