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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 Spring '10
 Selampinar
 Kinetics, Rate equation, Shumway

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