CHEM 14CL Summer 2006 Experiment #9 - Distillation and GC Guidelines Pre-lab guideline (I) On-line Technique and Resources For This Experiment Distillation chromatographic methods (II) Period 1: Due on 9/5 1. Title of the experiment, date, etc. 2. Reference to procedures 3. Procedure in Flowchart Format (for the entire experiment ). Make sure you reference the procedures 4. MSDS data for toluene and ethyl acetate. Include product name, Chemical Formula, Formula weight, Melting point or Boiling point and Density (if a liquid), Spill and Disposal procedures (summarize in your own words). 5. Complete question #1 in period 1 prelab assignment on page 105. (III) Period 2: Due 9/6 Complete the remaining two question in the prelab assignment on page 105 Data and observations (due at the end of each lab period). Sketch and label the distillation set up in your lab notebook. Record the temperature at which the first drop of condensate forms and the temperature ranges over which each of your fractions distilled. Record the gas chromatograph instrument setting used to obtain your chromatographCHEM 14CL Summer 2006 Distillation and Gas Chromatography (GC) Guidelines Refer to laboratory syllabus for the due date of the post-lab report. Post-lab report MUST be written inside your lab notebook. (IV) Post-lab (This is a GROUP Report) Write the names of the group members on the report. Write down the responsibilities of each group member in writing this report as well as in performing the experiment. (I) Abstract – outline the goals of the experiment as well as the technique that you used in achieving such goal(s). Also, summarize all experimental results. (II) Record the temperature at which the first drop of condensate forms and the temperature ranges over which each of your fractions distilled. (III) Label each of your gas chromatograms as to the sample injected. Calculate the % composition of each of your fractions from the gas chromatograms. Show ALL your work. Make sure your group attach the ORIGINAL GC chromatograms for the various fractions that you obtained in the lab to this post-lab report. (IV) Compare the retention time of the standard toluene/ethyl acetate mixture with your samples. What can you conclude? Explain. (V) Conclusion - Summarize your results - Justify the % composition results from the gas chromatograms. In other words, are they what you expected based on the theory of simple distillation? - Discuss how you could have achieved a better separation in the distillation. (VI) Sketch the GC chromatogram inside your lab notebook for your first distillate fraction based on the following conditions: (1) there had been twice as much toluene in the fraction (2) the GC column had been twice as long (3) the temperature of the column had been higher (4) the chart paper advance had not been turned on. DO NOT DRAW ANY SKETCHES ON YOUR ORIGINAL GC
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