Experiment 2 - Levke Johanna Deutsch Laboratory Report #2...

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Levke Johanna Deutsch Laboratory Report #2 Experiment II - Extraction and Washing- Name: Levke Johanna Deutsch Lab Instructor: Chris Henry Date: 06/12/2008 Due to: 06/19/2008 page 1
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Levke Johanna Deutsch Laboratory Report #2 Results and Discussion: The purpose of this experiment was to extract a non-polar organic liquid from water (part A), a colored polar organic solid from water (part B), and to wash an organic solid from contamination and purify it afterwards (part C). In part A 1 5.00g of liquid pentadecane and 25ml water were placed in a separatory funnel and well mixed. The clear aqueous bottom layer was drained and disposed of. The organic layer on top was clear as well and had a weight of 4.33g. There was no access to the refractometer and therefore the refractive index could not be determined. In Part A 2 25ml of water, 20ml of tert-butyl methyl ether, and 5.00g of liquid pentadecane were placed in a separatory funnel and well mixed. After the layers had been separated, the clear aqueous layer on the bottom was drained again. At first, the organic layer on top was cloudy after shaking. In order to dry the organic layer MgSo 4 was added. The MgSO 4 was separated from the organic layer with a gravity filter and then the dry liquid was placed on a steam bath to evaporate the t-butyl methyl ether. Evaporation ended after the first boiling period. After the evaporation the weight of the pentadecane was measured. The weight was 3.79g. Like in part A 1, the refractive index could not be measured so it cannot be determined how high the purity of the pentadecane is. In part B 10.0ml of 0.0001% aqueous crystal violet (light purple) and 10.0ml of methylene chloride (colorless) were placed in a separatory funnel and well mixed. After mixing, the top layer, which was supposed to be the aqueous layer (water drops were added and they did not go through the top layer), was cloudy and the bottom layer with the methylene chloride was light purple. Part C was about washing and purifying contaminated compounds. In part C
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This note was uploaded on 10/13/2008 for the course MISC 2610 taught by Professor Mikels,j. during the Fall '07 term at Cornell University (Engineering School).

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Experiment 2 - Levke Johanna Deutsch Laboratory Report #2...

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