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.