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Very quick question regarding melting point and purity

  1. Sep 16, 2013 #1
    1. The problem statement, all variables and given/known data
    For the following melting point, indicate what might be concluded regarding the sample purity:

    Melting point: 147ºC (dec.)



    2. Relevant equations
    I assume that (dec.) means that the sample decomposed.


    3. The attempt at a solution
    I am wondering if this means that the sample is practically 100% pure because it decomposed in such a small temperature window, or if the fact that the sample decomposed means that no useful information can be obtained.
     
  2. jcsd
  3. Sep 17, 2013 #2

    chemisttree

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    I would say the latter unless you know something more about how a pure sample of the analyte should behave. If it is supposed to melt and it decomposes, you have a reactive impurity. In my experience, reactive impurities mean strong mineral acids or oxidizers.
     
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