Fermentation And Distillation Chemistry Lab

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Purpose: The purpose of this lab is to prepare and purify a fuel, ethanol C2H5OH. We will learn to do so by the process of fermentation, and distillation. Over the course of 2-3 weeks, we will be collecting and analyzing the data for this lab. Hypothesis: If the alcohol ferments correctly, then 75% alcohol will be produced with a volume on 150 mL out of the initial 200 mL solution. Procedure: Refer to Chemistry Lab Manual pp. 33-35, 37. Results: The density of the yeast-sugar solution on day 1 was 1.05g/mL. On day 2, the density of the solution had dropped down to 1.00g/mL. We found the mass of our pure alcohol to be 10.23g. The volume of our pure alcohol was 10.97mL. With these numbers, we used the formula mass/volume to find the density of our pure alcohol to be .9325g/mL. The percent error of our experiment was found to be 18.19% with an absolute error of .1435%. Conclusion:The purpose of this lab is to prepare and purify a fuel, ethanol C2H5OH. We learned to do so by the process of fermentation, and distillation. Over the course of 2-3 weeks, we collected and analyzed the data for this lab. On day 1, we prepared our sugar-yeast solution which contained warm water, sugar, and yeast. With the help of the water, the yeast was then the reactant, then which was activated. The process that took place from week 1 to week 2, was the fermentation. We let the sugar-yeast solution set for this time. During this time, the solution went through a chemical change because it was unable to return to the state in which it started. During week 2, the process we performed, was called distillation. Distillation is when we set up a Distillation Apparatus and used a Bunsen Burner to complete the process. The alcohol part of the solution boils at 78oc. The water part of the solution boils at 100oc. Both solutions were under normal vapor pressure. While this process is

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