Kinetics Lab Report

Kinetics Lab Report - Chemical Kinetics Author Michelle...

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Chemical Kinetics Author: Michelle Abercrombie Lab Partners: Morgan Seidl, Crystal Murphy, Will Marcello Instructor: Ivan Ogloblin Chemistry 104B, section 19 Date work performed: 29 August 2007, 05 September 2007 Date work submitted: 12 September 2007 Abstract: Through the process of this experiment we will be attempting to determine the overall reaction order and overall rate constant for the reaction between bleach and red dye #3. This information will be determined by finding the concentrations of the dye used in the experiment through the use of a spectrophotometer at specific times to generate graphs of data that can be used to find the order and rate constant of the reaction. Overall in our experiment we found the order of bleach to be zero order and the dye to be first order with the rate constant being equal to 9.34x10 -4 .
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Introduction: In the chemical kinetics experiment, the bleaching of food bye will be examined. The experimental objective of is to generate the rate law by determining the order with respect to each reagent, the overall order of the reaction, and the rate constant, k. (Rate=[dye] n [bleach] m ). The bleaching of dye is assumed to be an elementary reaction, meaning that the order can be determined from the coefficients. NaOCl breaks a double bond within the dye molecule that helps the molecule absorb a certain wavelength of light. Two different methods are applied to determine the order of the reaction in respect to the two different reagents. The order with respect to red dye #3, (Erythrosin B) can be determined by making the concentration of bleach a constant and measuring absorbance of dye versus time, using Beer’s Law to calculate concentration in order to obtain the kinetic trace, which can then be used with the integrated rate laws to determine the order with respect to dye. The order in respect to bleach can be determined by using the proportionality comparing rate 1 and rate 2 from two different data sets with varying bleach concentration while keeping the dye concentration constant. From this the overall order of the reaction can be determined as well as the rate law for the equation. Reaction rate is valuable to know, it helps a chemist classify and better understand the processes involved with the proceeding reaction. The
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This note was uploaded on 04/03/2008 for the course CHEM 104B taught by Professor Staff during the Winter '07 term at Arizona.

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Kinetics Lab Report - Chemical Kinetics Author Michelle...

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