CHEM 2324 POST LAB QUESTIONS: Melting PointDetermination 3.A studen was given a

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CHEM 2324 POST LAB QUESTIONS: Melting PointDetermination 3.A studen was given a white solid for an unknown. Its meltingpoint range was119-121 degree Celsius. The student has previouslyworked with benzoic acid, and had observed that it was acrystalline solid with melting point of 122 degree Celsius. a. Can the student conclude the unknown is benzoic acid on thebasis of her work? wy? b. what additional experiemental work should be done to verifythis compound? CHEM 2324 POST LAB QUESTIONS: Melting PointDetermination 3.A studen was given a white solid for an unknown. Its meltingpoint range was119-121 degree Celsius. The student has previouslyworked with benzoic acid, and had observed that it was acrystalline solid with melting point of 122 degree Celsius. a. Can the student conclude the unknown is benzoic acid on thebasis of her work? wy? b. what additional experiemental work should be done to verifythis compound?

Explanation / Answer

a.) No, many compounds have the same meltingpoint. This measurement alone would not be consideredproof. b.) Purification - recrystallization with a number ofsolvents (both polar and non polar)       IR - this will show whatfunctional groups are present including aromatics       H-NMR and C-NMR - thiswill basically confirm what the IR told you and also giving moreinformation as to the connectivity of your functional groups       Mass spec - this will tell youthe mass of the compound, include/exclude the presence of nitrogen(rule of thirteen), and give even more evidence as to thecompound's connectivity.       Ester formation - form anester using an alcohol of your choice and run all of the previoustests to show you have the appropiate ester product. **** with all of these tests, this should confirm whether ornot the compound is benzoic acid HOPE THIS HELPS!!!

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