CHEM-C 127 Lecture Notes - Lecture 11: Acetic Anhydride, Intermolecular Force, Silica Gel

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20 Jul 2016
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Essentially: salicylic acid + acetic anhydride + heat = acetylsalicylic acid. Decomposes into acetic acid and salicylic acid over time. Learning goals: use qualitative test to assess purity of a sample, use melting point determinations to assess purity of a sample, use thin layer chromatography to assess purity of a sample. Safety: all liquid/solid waste should go in waste bottle, dispose of all glass in broken glass bucket, make sure melting point apparatus turned off at end. Melting point: every chemical compound has unique point. Intermolecular forces between molecules in crystal lattice control melting point. Impurities weaken intermolecular forces and lower melting point: can identify and assess purity of a compound. Salicylic acid has different melting point than aspirin- if measured value closer to salicylic"s melting point than aspirin"s, substance decomposed badly. Temperature at melting point identifies compound present.

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