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Lab experiment on melting point determination of pure compounds and mixtures (trans-cinnamic acid, urea). Includes techniques and data analysis.
First take a preliminary, fast melting point of the sample to get an idea of its mp. Second, very carefully and slowly measure the sample's melting point range. Finally, measure at least TWO mixed mps; choose the known sample that you think is your unknown and also another one that has a similar literature mp.
The melting point of a mixture containing the unknown sample and benzoic acid compared to the melting point of a mixture consisting of the unknown sample and 2-naphthol would be the best approach to determine if the sample is either pure benzoic acid or 2-naphthol.
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