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Gas Chromatography of Distillate

Gas Chromatography of Distillate. CHEM 315 Week of November 1 st , 2010 Alexis Patanarut. Due dates. Today Distillation of a Mixture lab report - at the beginning of class See http://classweb.gmu.edu/chemlab/sws/315/gc-rep.htm for instructions on how to go about assembling this lab report

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Gas Chromatography of Distillate

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  1. Gas Chromatography of Distillate CHEM 315 Week of November 1st, 2010 Alexis Patanarut

  2. Due dates Today • Distillation of a Mixture lab report - at the beginning of class • See http://classweb.gmu.edu/chemlab/sws/315/gc-rep.htm for instructions on how to go about assembling this lab report • Carbon copy from your lab notebook for today's experiment - at the end of class Next week • GC of Distillate lab report - at the beginning of class

  3. Purpose • The purpose of today's lab is to analyze the fragments you collected from your distillation last week via GC • You will be comparing the results of your GC chromatographs with your line/bar graphs from last week's distillation • Do they differ? • If so, how do they differ? • What do the peaks tell you about the composition? About the efficiency of the distillation techniques?

  4. Procedure • Inject a sample of your unknown mixture into the GC. • You can use the retention times from the GC-acetates experiment to identify the peaks • Inject the saved distillate fractions for the simple and fractional distillations • Calculate the mol % composition of the unknown • Use the thermal response ratios from the GC acetates lab to calculate out the mole ratios and then the mol % composition for your unknown • Compare your results with your conclusions by graphical methods last week

  5. Final notes • Work in the same groups as you did for the distillation experiment • Each student should inject at least one sample into the GC • After lab, each group should photocopy the gas chromatograms and distribute them among the group members

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