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April 1, 2015

Homework Help: org. chem.

Posted by CM on Tuesday, October 6, 2009 at 5:23am.

A student who was isolating aspirin stopped the experiment after the filtration step with alumina. One week later, the methanol was evaporated and the experiment was completed. The melting point of the aspirin was found to be 110-115 degress Celsius. Explain why the melting point was low and why the melting range was so wide.

My Answer:The melting point was low and the melting range was so wide because the aspirin partially decomposed. Therefore, it became impure and caused the melting range to widen. Due to the partial decomposition, the carbon backbone broke down some, which allowed the student’s aspirin to melt at a lower temperature.

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