Orgo 1 Lab 1 - Recrystallization Name: Stephanie Leath TAs...

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Recrystallization Name: Stephanie Leath TA’s Name: Gayan Senavirathne Lab Section: 012 Unknown : Unknown #3 Amount of unknown used : 1.506 Physical description of crude material : The material appeared to be powdery in texture and had a slight yellow tint to the color List the steps of recrystallization : 1. Place 1.5 to 2.0 g of impure unknown in a 250 mL Erlenmeyer flask and dissolve in the minimum amount of boiling water using a hot plate. You should know the exact mass of the amount of material you are using. There may be impurities insoluble in water, and a dark oil may form in the hot solution. If an oil forms this is called "oiling-out" and usually happens when a compound melts near the boiling point of the solvent being used. The oil will eventually go into solution although a small amount of additional solvent may need to be added. 2. The boiling solution is allowed to cool slightly, and a small amount (about 0.25 - 0.5 g) of charcoal is added. Estimate this amount by using the tip of a scoopula. If the charcoal is added to the boiling solution, it usually causes the solution to boil over the top of the flask. Never add a solid substance to a solution at or near its boiling point. 3.
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This note was uploaded on 04/23/2010 for the course CHEM CHEM2220 taught by Professor Andreana during the Fall '10 term at Wayne State University.

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Orgo 1 Lab 1 - Recrystallization Name: Stephanie Leath TAs...

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