Quiz1A - 1 CHM 2123, Quiz #1: Crystallization and...

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Unformatted text preview: 1 CHM 2123, Quiz #1: Crystallization and Extraction. Thin Layer Chromatography (TLC) as an Analytical Tool Assigned: September 14, 2006 Due: September 18, 2006 before 5pm MARKING SCHEME 1. Use flowcharts to describe two different methods for separating a mixture of the following compounds. (4 points) CO 2 H N Me exists in solution as CO 2 N Me H Flow chart 1: Add aqueous HCl and an organic solvent (EtOAc) N Me H Cl aqueous phase organic phase CO 2 H Add aqueous NaOH and an organic solvent (EtOAc) organic phase N Me aqueous phase NaCl * * * Following separation, the organic phase is dried (Na 2 SO 4 or MgSO 4 ) and the solvent is evaporated. Flow chart 2: Add aqueous HCl and an organic solvent (EtOAc) aqueous phase organic phase Add aqueous NaOH and an organic solvent (EtOAc) organic phase N Me aqueous phase NaCl * * MIXTURE CO 2 Na CO 2 H 2. Could ethanol be used as the organic solvent for the extractions in the previous question? Justify your answer in one sentence. (1 point) No, ethanol is miscible with water! 2...
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Quiz1A - 1 CHM 2123, Quiz #1: Crystallization and...

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