Discussion for Experiment 15

Discussion for Experiment 15 - : acetaldehyde. Wefirstc

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Discussion for Experiment 15: The Oxidation of Alcohol In this experiment we observed the oxidation of ethanol by chromic acid to form  acetaldehyde. We measured the rate of the reaction by recording the rate of disappearance of  chromic acid as a function of time using a spectrophotometer.  We first calibrated the spectrophotometer by collecting data of DI water. We then  collected the data of the potassium dichromate/sulfuric acid solution and determined the  optimal wavelength for measuring the absorbance. We then let the solution equilibrate to the  temperature of the spectrophotometer and then added 10x10 -6  L of ethanol to the solution. We  collected data for the new solution for 200 secs and then left the cuvette in the  spectrophotometer. We read and recorded the A O   at  t= 0 sec and the A OO   at the end of five  minutes. We then graphed the first order reaction, ln((A O -A OO )/(Abs-A OO )) vs. time and then the  second order reaction 1/Abs vs. time.  For optimal wavelength we measured 442.0 nm, which was between the excepted 430 to  455 nm. For initial absorbance we got A
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This note was uploaded on 05/06/2011 for the course CHEM 1CL taught by Professor Van koppen during the Spring '06 term at UCSB.

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Discussion for Experiment 15 - : acetaldehyde. Wefirstc

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