This could have been prevented if one would have been more careful when

This could have been prevented if one would have been

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dry, causing them to fall off the filter paper. This could have been prevented if one would have been more careful when carrying the desiccator and putting it in the drawer. Additionally, the microscale recrystallization recovery rate was 26.7%. This could be because more solvent was added to the unknown compound than necessary, causing some of the compound to remain partially dissolved and evading the filtration process. In order to prevent this, one would have to add water to the compound very slowly to add the minimum amount of solvent required.
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Conclusion The unknown compound was identified as Benzamide using the recrystallization technique. Furthermore, there was a 2% recovery rate for macroscale recrystallization and 26.7% recovery rate microscale recrystallization technique. The melting point range identified for Unknown #1 (126.5 -128.6 °C) was very similar to that of the literature melting point values for Benzamide (127-130 °C). In addition, the mixed melting point range (126.6-128.9 °C) was also very similar to that of the unknown compound, thus the unknown compound was identified as Benzamide. Additionally, the macroscale recrystallization was successful but had a 4% recovery rate because the precipitate fell in the desiccator. For the microscale recrystallization, some of the compound remained dissolved in the excess solvent and thus the recovery rate was 26.7%. Post Lab Questions: Experiment 0 1. The melting point is the temperature at which solid and liquid phases of a pure substance coexist at a pressure of 1 atm. At slightly higher temperature only liquid exists, while at slightly lower temperature only solid remains. The melting point of a solid is used by organic chemists to identify the compound, and also to establish its purity.
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  • Fall '13
  • JeramyBaum

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