Ethanolnotesfall04

Ethanolnotesfall04 - dry Celite into about 50 mL of water....

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Ethanol from Sucrose Procedure Notes/Modifications Week 1 1) Prepare the fermentation setup according to the procedure outlined in the text on pg 137. 2) Be sure the glass tubing does not extend more than 2-3 cm into the 250 mL flask. This will prevent the mixture from moving into the CO 2 trap. 3) Be sure to seal it well to prevent oxygen from entering. 4) Place about 50 mL of saturated barium hydroxide into a 100 mL beaker for the CO 2 trap. 5) Place approximately ½ cm of mineral oil above the barium hydroxide trap. 6) Barium carbonate should begin to form within about one hour. If not, make sure you put sugar and yeast in the flask. 7) Leave the setup for one week to allow time for the reaction to proceed at room temperature. Make sure your flask is labeled with your name and section number. Week 2 1) Carefully decant the mixture into a beaker. 2) If the mixture is not clear, prepare a Celite filter by placing about a tablespoon of
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Unformatted text preview: dry Celite into about 50 mL of water. 3) Pour the Celite mixture through the Buchner funnel with filter paper. 4) Repeat this procedure until about cm of Celite has been added to the funnel. 5) Be sure to discard the water at this point. 6) Filter the ethanol mixture through the prepared Celite filter. 7) Cut the ethanol mixture by one-half at this point. 8) Add 10g of K 2 CO 3 for each 20 mL of your ethanol mixture. Distillation 1) Prepare the fractionating column using your west condenser and copper mesh. 2) Make sure the mesh is loose enough to allow a good flow of ethanol vapors. 3) Collect only the fraction that distills between (78 -88C). Do not adjust the transformer voltage after the proper distilling rate has been established. Calculate the density the ethanol mixture and compare it to the table provided on page 138 of the text to determine the percentage of ethanol by weight....
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This note was uploaded on 07/10/2011 for the course BCH 4033 taught by Professor Stern during the Summer '11 term at UNF.

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