Lab Report Exp13

Lab Report Exp13 - Ryan Cohen Oxidation of Alcohol The...

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Ryan Cohen 4/10/09 Oxidation of Alcohol The purpose of this lab was to observe the chemical kinetic process involved in the oxidation of alcohol. Using a spectrophotometer to observe the oxidation of ethanol to produce ethanal, the rate of the reaction was studied. Specifically, the rate constant, k, for the reaction was determined by measuring the rate of disappearance of chromic acid in solution. The lab used a spectrophotometer to measure the absorbance of chromic acid in the oxidation of alcohol, in order to calculate the rate constant, k, of the reaction. A small sample of ethanol was mixed with chromic acid in a cuvette and analyzed in the spectrophotometer. The resulting reaction went as follows: 3CH 3 CH 2 OH (aq) + H 2 CrO 4 (aq) 3CH 3 COH (aq) + 4H 2 O (l) Since the absorption of light through the solution and the concentration of chromic acid are directly related, the absorbance information mirrored a plot of the disappearance of chromic acid over time. ln((A 0 -A )/(Abs-A )) was plotted vs. time and 1/Abs was plotted vs. time, where a
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