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Organic Chem I Lab Midsemester Capstone

by: Nicole Kinney

Organic Chem I Lab Midsemester Capstone CHEM 231 A01

Marketplace > Indiana University of Pennsylvania > Organic Chemistry > CHEM 231 A01 > Organic Chem I Lab Midsemester Capstone
Nicole Kinney
GPA 3.02
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About this Document

Midsemester capstone write-up for lab experiment
Organic Chemistry I
Carl Leblond
Class Notes
organic, Chemistry, lab




Popular in Organic Chemistry I

Popular in Organic Chemistry

This 3 page Class Notes was uploaded by Nicole Kinney on Friday July 29, 2016. The Class Notes belongs to CHEM 231 A01 at Indiana University of Pennsylvania taught by Carl Leblond in Summer 2016. Since its upload, it has received 12 views. For similar materials see Organic Chemistry I in Organic Chemistry at Indiana University of Pennsylvania.

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Date Created: 07/29/16
Nicole Kinney & Alysa Polka 6/15/16 Chem 231 Lab Mid Semester Capstone To whom this may concern, As members of the Jimmy Stewart Chemical Company we have been working on a  solution to recycle the excess dye and acetone found in the dye vats and we think we have come  to a conclusion.  To begin, we put a 60mL solution in the boiling flask of a fractional distillation setup.  The 60mL solution consisted of: 40mL of acetone, 10mL of 1­propanol, 10mL of cumene, and  0.250% 4­carboxyyazobenzene organic dye. Literature resources provided the various boiling  points of the solution components which provided reference points during the procedure. With  acetone boiling around 56 degrees Celsius, we heated the boiling flask with a thermowell  approximately to the boiling point of acetone thus beginning our fractional distillation procedure. Once the acetone begins to boil, it will run up the fractional column and through the  condenser returning to its liquid phase. Collect the dripping acetone every 5 mL in test tubes,  capping with cork stoppers to prevent evaporation. Later the test tubes will be used to find the  refractive index of the liquid to determine the purity of the acetone. You should observe two  spikes in the temperature: the first when all the acetone has been distilled and you start to distill  1­propanol, and the second when you are finished distilling 1­propanol and start distilling  cumene. You should stop your distilling process at the time you start distilling cumene or you  reach 10 mL of your solution in the boiling flask. Transfer the remaining 10 mL of solution into  a separatory funnel and add 10 mL of 10 % NaOH. This is where the extraction process begins.  Mix the solutions and release the pressure. Let this solution settle before releasing the bottom  layer. This layer is the dye and NaOH. Add HCl by the dropper full until your solution turns and  remains white after swirling your solution. You will cool this solution in an ice bath and return to it later. Pour the top layer (cumene) out of the top of the separatory funnel and measure how  much you have recovered. You are now finished with the cumene layer and will dispose of it  properly. Returning to the now cooled dye and NaOH solution, you will transfer it to a vacuum  filtration device. Have this set up prior to cooling your solution so that you are prepared. Once  the solution has been filtered let it vacuum for at least 5 minutes to ensure drying of the extracted dye. Weigh a small watch glass in the meantime. Once you let the dye vacuum for 5 minutes put  the extracted dye on the small watch glass and reweigh. Take the difference of the two weights to determine how much dye you recovered. Clean up your workstation, and dispose of chemicals  properly. Our Observations and Outcomes: RI 100% Acetone: 1.360 RI 100% 1­propanol: 1.387 1.360−1.387 x−1.387 = −100 15−100 x−1.387 0.0027= 15−100 −0.02295=x−1.387 x=1.3641 Test tube #4 RI: 1.361 (So we collected test tubes 1­4) Test Tubes 1­4 (each with 5mL of acetone) = 20mL of acetone with purity >85% 20 mL of 85% Acetone recovered 20mLrecovered % Recovery:  =0.50×100=50 Acetone Recovered 40mLinitial 6 mL of Cumene recovered  6mLrecovered % Recovery:  =0.60×100=60 CumeneRecovered 10mLinitial 0.005 g of dye recovered We hope you found this information useful, and will continue to use this process. Sincerely, Nicole Kinney Alysa Polka


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