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Lab write up #2 - The Determination of Rate Law Using...

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The Determination of Rate Law Using Chemical Kinetics Author: Karlie Shumway Lab Partners: Sarah, Allisa, & Collin Instructor: Kento Chem 152, section 1D Date Work Performed: August 31, 2010 Date Report Submitted: September 14, 2010 Abstract The purpose of this experiment was to determine the rate law for a dye bleach reaction. The rate law was determined to be R=0.00894 s -1 [dye] 0 [bleach] 1 . The absorbance vs. time was measured and plotted on a graph. The rate constant k was determined using the rate law formula; rate=k[dye] a [bleach] b . The order of the dye reaction was proven to be a zero order reaction due to the fact that the graph of [A] vs. T shows a linear relationship. a was found using the integrated rate law, and b was found by comparing two different rates from two bleach concentrations.
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Shumway, 2 Introduction Chemical kinetics is the study of the rate at which chemical reactions proceed. It deals with the experimental determination of reaction rates from which rate laws and rate constants are derived. The purpose of the chemical kinetics lab involves determining the order of the reaction with respect to both the dye and bleach, then determining the rate constant, k using the integrated rate law. Our expectations in this experiment were to find a , b , and k. This experiment, if done correctly, is proven to work based on the fact that it is mainly mathematic calculations once each graph and slope has been plotted in respects to concentration over time. The rate of a reaction often depends on the concentration of one or more of the reactants. The order of a reaction can be determined only by experiment by plotting and graphing and finding the slope. Once absorbencies vs. time are plotted on a graph, one may find a and b . After determining a and b , rate constant k can be determined by deriving the instantaneous rate of reaction.
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