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andrade1 - EXPERIMENT 1: GAS-LIQUID CHROMATOGRAPHY (FORMAL)...

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EXPERIMENT 1: GAS-LIQUID CHROMATOGRAPHY (FORMAL) Introduction ___15__ / 20 pts Procedure: Day 1 and 2 ___7__ / 8 pts Data ___27__ / 35 pts Sample computer chromatograms from both Day 1 and 2. (11 points) Data Table I (8 points) Data Table II (8 points) Data Table III (8 points) Note: On the sample chromatogram the peaks should be identified and the GC temperature, attenuation and flow rate settings should be given. Sample Calculations __21___ / 24 pts Calculation of the partition coefficient from Day 1. (6 points) Calculation of average % ethanol, the standard deviation and % RSD for Day 1: Use of standard calibration plot. (9 points) Calculation of average % ethanol, the standard deviation and % RSD for Day 2: Use of standard addition method (9 points) Results __43___ / 44 pts Calibration plot from Day 1. (10 points) Standard addition plot from Day 2. (10 points) Day 1, the % EtOH from test extraction sample. (8 points) The % alcohol in beverages A, B, and C. (8 points) Experimentally determined partition coefficient. (8 points) Discussion __25___ / 30 pts Short discussion of the calibration plot. Short discussion of the standard addition plot. Significance of calculated partition coefficient and how it applies to this experiment. Discussion of the differences between the % alcohol in each of the beverage samples. Problems in experiment. Error analysis. Observations from the experiment. 5 Questions (6 points/question) __16___ / 30 pts Style (organization, spelling, neatness, grammar…) ___9__ / 9 pts Other Deductions (i.e., Late Lab Report) - _____
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Score ___162____ / 200 pts
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Laboratory in Separations and Analytical Characterization of Organic and Biological Compounds Francisco Andrade Jessica Booe 5/12/10 Wesley Storm CHEM 241L 402, Morehead Labs Room 301 Pledge
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Introduction: The main point of this experiment is to separate and analyze components of different beer samples using solvent-solvent extraction and gas-liquid chromatography. The objective of the first part of this experiment is to extract ethanol from solutions and quantitatively and qualitatively analyze the extract using gas-liquid chromatography. On the second day of the experiment, the method of standard addition will be used to determine the percent ethanol extracted from beer samples and analyze this extract. Solvent-solvent extractions are done in order to analyze everyday complex mixtures. Because most substances such as soil, milk, and in this case, alcoholic beverages are composed of several different chemical compounds that can cause interference during analysis, both a standard addition and standard calibration plot to be made for each individual analyte. This is why when conducting the experiment, the analyte has to be separated from the sample matrix and different methods of analysis have to be conducted. A solvent-solvent extraction will be used to remove ethanol from a mixture by adding a
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This document was uploaded on 11/04/2011 for the course CHEM 241 at UNC.

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andrade1 - EXPERIMENT 1: GAS-LIQUID CHROMATOGRAPHY (FORMAL)...

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