Recrystallization and Melting Point

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Presentation transcript:

Recrystallization and Melting Point Summer 2012

Purification and Characterization Purification: separation of target compound from impurities Characterization Identity: Do I have what I think I have? Purity: How pure is the compound?

Recrystallization Purification for solids Useful for Large samples Final purification step Based on differential solubility

Practical Aspects Impure Solid  Dissolve Recrystallize Filter www.whfreeman.com/mohrig3e then Movies and Spectra  Williamson Movies  5.3 Recrystallization (macroscale) (Also look at others, such as Drying Organic Liquids and Melting Points)

Recrystallization: Theory IMF in solids Temperature dependence Equilibrium process in slow crystal formation

Important Points Choice of solvent Mixed solvents Maintaining hot solvent Safety when boiling Hot filtration Inducing crystallization Washing crystals Too much/too little solvent Oiling out

Melting Point Physical property to characterize substance Identity purity capillary Melt-temp

Theory and Application Pure crystals and impure crystals Intermolecular Forces Lattice energy Application Depressed MP Broad MP Mixed MP Eutectic mixture