results lab 1

results lab 1 - Michele Chan Chem2211L Adna Muliawan...

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Chem2211L Adna Muliawan 9/16/10 Results Data: Unknown: m2750E Mass of unknown: 1.00g Mass added H2o: 10ml, Additional H2o: 10mL Mass of purified solids: 0.102g Melting point range of purified solid trial 1:81.7C -82.5C Trial2:85.1C-93.2C Trial 3:70.0C-84.0C Melting point range of unknown and vanillin: 63.5-69.1 ° C –clear liquid Melting point range of unknown and ethyl 3,5-dinitrobenzoate: 65.1-70.1 ° C yellow liquid Melting point range of unknown and o-tolvic: 101-103 ° C clear liquid Melting point range of unknown and acetanilide: 103-103.5 ° C yellow liquid Percent yield: 10.2% Discussion: Due to the melting range we had for our unknown, we had proposed that Vanilin was the unknown sample. The melting range we got for the unknown was a few degrees below that of Vanilin. Therefore, we performed the melting point determinism by creating a mixture that consisted of 50% vanillin and 50% of the unknown. However, the resulting melting point for the mixture was significantly lower than what we received for the unknown. So we assumed that Vanilin was not the correct compound and continued to test the next possible option. The next test we tried of the unknown in another 50/50 mixture raised the temperature to above the range of vanillin. We discovered that the mix with ethyl 3,5-dinitrobenzoate, which gave a yellow rather than clear liquid, melted at a similar range to that of the vanillin mixture, but was still lower than the melting range of our unknown. SO we tested another compound, the o-tolvic acid
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results lab 1 - Michele Chan Chem2211L Adna Muliawan...

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