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QUESTION
After obtaining a preliminary melting point range of 140-147 oC for an unknown, you identify it as o-nitrobenzoic acid.
After obtaining a preliminary melting point range of 140-147 oC for an unknown, you identify it as o-nitrobenzoic acid. Running a mixed melting point determination with o-nitrobenzoic acid affords a melting point range of 126-138 oC. What does this tell you about your initial assumption concerning the identity of your unknown solid? Why did your melting point change so dramatically?
