(Answered) After getting a preliminary melting point range of 140-147

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After getting a preliminary melting point range of 140-147 degrees C for an unknown, it is identified as o-nitrobenzoic acid. Running a mixed melting point determination with o-nitrobenzoic acid affords a melting point range of 126-138 degrees C. What does this say about the initial assumption concerning the identity of the unknown solid? Why did the melting point change so dramatically?

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