MH Report Guidelines for Extraction of Caffeine#7a W16

MH Report Guidelines for Extraction of Caffeine#7a W16 -...

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CHEM 14CL W INTER 2016 E XPERIMENT #7 A : E XTRACTION AND P URIFICATION OF C AFFEINE FROM T EA L EAVES Experiment #7A IS AN INDIVIDUAL WORK & REPORT 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. There is ONLY ONE pre-lab report for this experiment even though this is a 9-hour lab (3 lab periods). On-line Resources AND T UTORIALS For This Experiment: Please click on the following links to view the following: Theory of Extraction ( Real Player Video ); Extraction Tutorial ; Thin Layer Chromatography (TLC) Tutorial ( II ) P RE - LAB R EPORT G UIDELINES (P RE - LAB REPORT MUST BE WRITTEN INSIDE YOUR LAB NOTEBOOK ) NOTE that ONLY parts 1, 2 and 3 are DUE on Tuesday & Wednesday 1/19 & 20 & Part 4 (study questions) is DUE on Thursday & Friday 1/21 & 22 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: C HANGE 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.
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