4ReportGuidelinesforExtractionofCaffeine7a

4ReportGuidelinesforExtractionofCaffeine7a - CHEM 14CL...

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CHEM 14CL SUMMER 2008 EXPERIMENT # 7A: EXTRACTION AND PURIFICATION OF CAFFEINE FROM TEA LEAVES IMPORTANT: Make sure that you follow the proper laboratory safety protocol (refer to the course syllabus) BEFORE going to the lab. You will be dismissed from the laboratory if you do not follow the proper safety protocol. (I ) PRE-LAB REPORT GUIDELINES (PRE-LAB REPORT MUST BE WRITTEN INSIDE YOUR LAB NOTEBOOK) NOTE that ONLY parts 1, 2 and 3 are DUE on 8/13 &Part 4 (study questions) is DUE on 8/14 There is ONLY ONE pre-lab report for this experiment even though this is a 9-hour lab (3 lab periods). 1. Introduction - list the goal(s) of the experiment as well as any experimental techniques that will be used during the experiment for purification and/or identification. Include references and the changes to the procedure noted below: CHANGE IN THE LAB PROCEDURE On page 79, make the following changes to the LAST SENTENCE in the first paragraph: Instead of “Add the 1-propanol from the first two extractions to the funnel” Replace it with “Add the 1-propanol from the last 2 extractions to the same beaker used previously to store the other 1-propanol layers.” Also on page 79, in the second paragraph, the drying agent will be anhydrous sodium sulfate and NOT anhydrous sodium sulfite. On page 79, in the middle of the third paragraph replace "Repeat the extraction 2 more times with an additional 10mL of acetone each time,. ..." with "Rinse the NaCl precipitate in the beaker 2 more times with an additional 10mL of acetone each time. ..." 2. Flowchart - Prepare a flowchart of procedures AND show the location of the caffeine throughout each step of the experiment in the flow chart. Make sure you also REFERENCE the procedures. 3.
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This note was uploaded on 08/27/2008 for the course CHEM 14CL taught by Professor Henary during the Summer '08 term at UCLA.

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4ReportGuidelinesforExtractionofCaffeine7a - CHEM 14CL...

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