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Test 101

by: Fatima Ghufran

Test 101

Fatima Ghufran

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This 2 page Class Notes was uploaded by Fatima Ghufran on Monday September 19, 2016. The Class Notes belongs to at University of Texas at Dallas taught by in Fall 2016. Since its upload, it has received 2 views.


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Date Created: 09/19/16
LAB REPORT FOR EXPERIMENT #2: PURIFICATION OF  ACETANILIDE BY RECRYSTALLIZATION Your name  TA’s name Your Partner’s name  Lab Section OBSERVATIONS: A. SELECTING A RECRYSTALLIZATION SOLVENT Solubility Test (cold) Solubility Test (hot) Water insoluble soluble pet ether insoluble insoluble ethanol fairly soluble readily soluble acetone very soluble readily soluble After looking at the solubility of impure acetanilide in the four solvents, water seems to be the best choice as a recrystallizing solvent. B. DECOLORIZING A SOLUTION OF IMPURE ACETANILIDE AND HOT FILTRATION 2. 1.5637 grams of impure acetanilide 5. 38 ml total solvent volume 7. Added tip of carbon black to mixture and mixture almost  boiled over! 8. 28 ml total solvent volume C. ISOLATING THE RECRYSTALLIZED PRODUCT WITH VACUUM  FILTRATION 2. Chilled crystals in ice bath for 19 minutes. collected flaky white crystals Mass of watch glass and acetanilide = 22.5478 Mass of watch glass = 21.6903 Mass of recovered acetanilide = 0.8575 g Mass of impure acetanilide = 1.5637 g Percent recovered = 54.8 % D. DETERMINING THE MELTING RANGE Melting range of recrystallized acetanilide = 112 – 114  C o Melting range of impure acetanilide = 105 – 111  Co CONCLUSION: In this experiment a technique was used that will be used  frequently throughout the semester: Purification by  recrystallization. This technique allows for the  purification of a crude material.  The small loss in  yield  is made up by the high gain in purity.  The purity of the  material obtained can be correlated to the sharpness and  veracity of the melting point data and this was observed.   QUESTIONS:  1. Did recrystallization improve the purity of your  acetanilide? How can you tell? Yes, the melting point range of the recrystallized  material was very narrow and was close to the literature  value. 2. Assume that your original sample of acetanilide was 90%  pure. What was the maximum amount of pure acetanilide  that you could recover after your recrystallization? Mass of impure acetanilide = 1.5637 g Mass of maximum amount of pure acetanilide = 1.5637 X 90% = 1.4073 g 3. How much acetanilide did you lose during the entire  recrystallization process? Where did the losses probably  occur? Mass of recovered acetanilide = 0.8575 g Mass of lost acetanilide = 1.4073 ­ 0.8575 = 0.5498 g 1) In the hot filtration step, material crystallized in  filter paper. 2) In the second filtration step, material was lost on  filter paper 3) Material did not completely crystallize from solution


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