11_17_2007_Identify Aldehyde Lab Report

11_17_2007_Identify Aldehyde Lab Report - Identification of...

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Identification of Aldehyde Lab Report Norbert Wang (Section 113) 1. Melting point is a fairly unique property and was essential in identifying the unknown aldehyde. However, sometimes similar compounds have similar melting ranges. In order to distinguish them apart, they need to reacted into a new class of compounds and have their melting ranges compared with a resource. The aldehyde was first reacted with dimedone to make a dimethone derivative. Then it was reacted with HCl to form a dimethone anhydride derivative. The melting range for the dimethone derivative was 186-187 C (3, B). The melting range for the dimethone anhydride derivative was 188- 190 C (3, M). It was necessary to have two melting points because some of the dimethone derivatives on the table had similar melting points (i.e. 4-nitro benzaldehyde and 4-hydroxybenaldehyde with 188-190 C for their dimethone derivatives). Each compound on the chart had a unique combination of the two values. Thus, the only aldehyde that had 186-187 C dimethone derivative and 188-190 C dimethone anhydride
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This lab report was uploaded on 04/05/2008 for the course CHEM 3BL taught by Professor Chunmei during the Spring '08 term at University of California, Berkeley.

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11_17_2007_Identify Aldehyde Lab Report - Identification of...

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