SC CHEM 333 - Chemical Extraction Post-Lab (7 pages)

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Chemical Extraction Post-Lab



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Organic Chemistry 333L section 03M Laboratory Post Lab Chemical Extraction By Cameron Kahn 14 January 2019 TA James Collie 1 Page Observations In the chemical extraction experiment he she took four 4 test tubes and added a liquid solution to each one During the experiment the test tubes changed colors Below is a table and the color changes that were observed Test Tube Colors Test Tube Before mixing A Clear liquid B Orange brown C Light orange yellow D Liquid orange white After mixing Clear liquid with white pieces Brown orange on top cream white on bottom Orange with MgSO4 cluster Solid orange white Final product White powder crystals Very light orange white Separated into test tube D Crystal yellowish light brownish The starting ternary compound a light brown and white powder mixture was added to a large test tube Next ether was added and a distinctive odor smell was noted and white pieces were seen When hydrochloric acid was added to the test tube bubbles and precipitate formed Finally when adding magnesium sulfate lumps of magnesium sulfate observed on the bottom of the test tube See the extraction flow diagram for a visual reference of the process for the experiment both diagrams came from George Handy s lab manual and I do not take credit for making them 2 Page Results The initial mass of the ternary mixture was 1 030 grams g The Mass of benzoic acid recorded minus the filter paper was 0 277 g The melting point of benzoic acid recorded was 121 4 C and percentage composition was 26 89 The mass of 2 naphthol minus the filter paper was 0 125 g The melting point of 2 naphthol record was 95 30 C and percentage composition 12 14 The 3 Page Mass of naphthalene minus the mass of the test tube was recorded to be 0 324 g The melting point of naphthalene record was 71 1 C and the percent composition was 31 46 The total final mass of the ternary mixture was 0 726 g Therefore the percent recovery of the ternary mixture was 70 49 Calculations Chemicals Benzoic Acid 2 Naphtol Naphthalene Total Mass final Mass with filter paper Mass of filter paper Product 0 465g 0 188g 0 277g 0 311g 0 186g 0 125g 8 304g 7 98g 0 324g Mass of test tube Benzoic Acid 2 Naphtol Naphthalene Ternary Mixture 0 277g 0 125g 0 324g 0 726g Percent Compositions Chemicals Element Mass Grams Compound Mass Grams 100 Benzoic Acid 0 277 100 26 89 0 726 2 Naphthol 0 125 100 12 14 0 726 Naphthalene 0 324 100 31 46 0 726 Chemicals Ternary Mixture Percent Recovery Final Mass Grams Initial Mass Grams 100 0 726 100 70 49 1 030 Conclusion The results for this experiment vary due to the use of the separation funnel In order to get the bottom layer out without contaminating the solution some part or the bottom remained in the separation funnel Then to remove the finally bit of the bottom layer in the separation funnel some part of the top layer had to be removed with the bottom Also product was lost when transferring from test tube to separation funnel and back into another test tube The mass of benzoic acid and 2 naphthol was lost during suction filtration Due to the loss of products the 4 Page percent composition for each compound ended up to be low Also due to the loss of product during the experiment the percent recovery of the ternary mixture was 70 49 Besides the general steps and use of the apparatus for a chemical extraction the experiment also taught one to be careful with the transfer of compounds aqueous solutions The IR analysis does not fully support the experiment and its findings The IR spectroscopy machine malfunctioned and there were fingerprints detected that screwed up the readings IR analysis Readings most likely contain errors due to machine malfunction Sample A Benzoic acid CH2 bending vibrations 1250cm 1 Acid chlorides 1770cm 1 Sample B 2 naphthol 5 Page Fingerprint region 700cm1 1735cm indicates ester 1 1250cm 1 Fingerprint region Fingerprint region 700cm 1 Sample D naphthalene 4000 2500cm 1 error in machine no definitive indications 1100 1750cm 1 error in machine no definitive indications Fingerprint region 700cm 1 References 1 Handy Dr George Ali Salman Experiments in Organic Chemistry Fall 2013 2014 University of South Carolina Department of Chemistry and Biochemistry 6 Page 2 Extraction in Theory and Practice Part I Extraction in Theory and Practice Part I University of California Los Angeles 23 June 2003 Web 22 Sept 2013 7 Page


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