Chem 3BL - Lab Report E#24

Chem 3BL - Lab Report E#24 - Kylie 17 November 2010 Chem 3B...

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Kylie 17 November 2010 Chem 3B Lab Experiment #24: Aldehyde #10 – Qualitative Analysis Discussion: I reacted my unknown aldehyde (#10) with dimedone, and then reacted the dimethone derivative with HCl to obtain the dimethone anhydride derivative. I recorded the melting point range of both derivatives and compared the values with the provided literature melting points, and then used a process of elimination to identify the matching aldehyde. It was necessary to obtain two derivatives because the possible aldehydes had similar or overlapping melting point ranges, and also because it was possible to have an inccurate range due to insufficient drying and impurity. For example, after obtaining my dimethone derivative MP range, I made an incorrect assumption because my range was inaccurate (it was closer to the range of piperonal's dimethone derivative). I needed the dimethone anhydride derivative value to have a unique pair of MP ranges (which allowed me to eliminate veratraldehyde, cumin aldehyde, and piperonal). Meta-tolualdehyde is a clear, brownish-yellow liquid; this matches with my observations of aldehyde #10, which was a clear light brown liquid. Also, both compounds have a strong, fruity
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Chem 3BL - Lab Report E#24 - Kylie 17 November 2010 Chem 3B...

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