Posting 07 - Hints for preparation for the Recrystallization Experiment

Posting 07 - Hints for preparation for the Recrystallization Experiment

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Copyright © 2016. Govindarajoo, G. Rutgers, The State University of New Jersey. All rights reserved. Hints for preparation for the Recrystallization Experiment. Students will have to be extremely efficient with their time while carrying out this reaction. Students must wear nitrile gloves for this experiment. Turn on heating mantle to level 4 (not higher) as soon as you get into lab. Each student will need to weigh two samples of Acetanilide – 50 mg each. ( Make sure you record the actual mass in your observations and use this mass as the mass for the original sample in the % recovery calculations) For each recrystallization, the following should occur: 1) heating of the required solvent in a 10-mL Erlenmeyer flask on the heating mantle (make sure boiling stick is in the flask while heating) 2) dissolving of crystals using hot solvent (this should occur in a disposable test tube). Use a pipette to take up solvent from Erlenmeyer flask and add dropwise to crystals. Then, add a boiling stick to the test tube and heat it briefly so that crystals stay in solution. Add the MINIMUM AMOUNT OF HOT SOLVENT required to fully dissolve the crystals. 3) remove boiling stick, insulate test tube with paper towels and place test tube in a beaker to cool slowly to room temperature.
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  • Spring '09
  • Govindarajoo
  • Laboratory glassware, Test Tube, Acetanilide

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