Lab6 QualitativeAnalysis - Identifying the Structure of an...

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Identifying the Structure of an Aldehyde by Qualitative Analysis Anita Wong, Lab Section 302, Performed November 7, 2007 Purpose In this lab, the identity of an unknown aldehyde was determined by melting point analysis. Because many of the aldehydes have similar melting points, the aldehyde was reacted to form a dimethone, and then reacted again to form a dimethone anhydride derivative. By measuring the melting point of the dimethone and the dimethone anhydride derivatives, the identity of the original aldehyde can be determined. Results The dimethone derivative produced weighed 0.156 grams, which equated to a 25.7% yield. The product was slightly yellow in color and powdery. The melting point was determined to be 194.7-197.2°C. The dimethone anhydride derivative product obtained weighed 0.011 grams for a yield of 20.2%. The product consisted of small white crystals, and had a melting point range of 226.4-228.3°C.
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This note was uploaded on 07/15/2008 for the course CHEM 3BL taught by Professor Chunmei during the Fall '08 term at University of California, Berkeley.

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Lab6 QualitativeAnalysis - Identifying the Structure of an...

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