UCSD CHEM 143A - Experiment V (6 pages)

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Experiment V



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Experiment V

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Pages:
6
School:
University of California, San Diego
Course:
Chem 143a - Organic Chemistry Laboratory

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Experiment V Separation of an unknown two component mixture by distillation and identification of the components by GC analysis Reading assignment Techniques in Organic Chemistry 2nd ed pages 127 137 142 145 190 205 3rd ed pages 141 161 256 272 Topics and Techniques i methods techniques and separation of liquids using the process of distillation ii gas chromatography relative response factors and analysis iii monitoring separation of distillate fractions by gas chromatography The experiment overview In this experiment your TA will assign students to pairs Each couple will be given 100 mL of an unknown two component mixture One student will perform a fractional distillation of the unknown mixture 50 mL and the second student will perform a simple distillation of the unknown mixture 50 mL Each distillation will generate four 10 mL fractions to be analyzed using gas chromatography for mole fraction composition In order to analyze the mixture each couple will have to obtain relative response factors from a standard of four component known mixture Employing these relative response factors to the results of the unknown mixture will give the amount of each component Approximate boiling points of the low and high boiling components comprising the twocomponent unknown mixture can be obtained from the fractional distillation data and or gas chromatography analysis These data will permit the students to identify the two unknowns comprising their unknown mixture The names of the students must be written on the first page of their laboratory experiment in each student laboratory notebook Note you work collect and share data as a as a team but each student writes his her own laboratory report It is each students responsibility to obtain all laboratory data so make arrangements i e immediately at the end of the laboratory to have all laboratory data including photocopied gas chromatograms Liquid unknowns Your unknown two component mixture will be a mixture of two of the four



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