Modified Directions for Expt. 4.5 Recrystallization...

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CH210L Expt. 4.5: Crystallization of Benzoic Acid from water and a mixed solvent Procedure adapted from Williamson, Kenneth L.; Minard, Robert D.; Masters, Katherine M. Macroscale and Microscale Organic Experiments, 5 th ed. selected chapters; Houghton Mifflin Co.: New York, 2007, pages 81-83 or Williamson, Kenneth L. and Masters, Katherine M. Macroscale and Microscale Organic Experiments, 6 th ed. selected chapters; Houghton Mifflin Co.: New York, 2011, pages 79 -81. Microscale Procedure for Benzoic Acid from Water Using Vacuum Filtration and a Hirsch Funnel . Recrystallize ~50 mg (0.050g) of benzoic acid from the minimum volume of water. Add the solid to a 10 x 100 mm reaction tube and add water dropwise with a Pasteur pipette (NO MORE THAN 5 DROPS WILL BE NECESSARY). Use the calibration marks on the reaction tube to measure the volume of water. Add a boiling stick to facilitate even boiling and to prevent bumping. After a portion of water has been added, gently heat the solution to boiling on a hot sand bath. The deeper the tube is placed in the sand, the hotter it will be. As soon as boiling begins, continue to add water dropwise until the entire solid just dissolves.
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