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Full report of the determination of the rate order for the reaction between acetone and iodine respect to acetone using the initial rate method$9.71
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PHYSICAL CHEMISTRY III
EXPERIMENTAL REPORT I
KINETICS: Rate law
Surname and initials :Ragolane k.c
Student n.o:218240402
Date : /02/20
, AIM
To determine the rate order for the reaction between acetone and iodine respect to
acetone using the initial rate method.
ABSTRACT
The aim of the experiment was to determine the rate order of the reaction between
iodine and acetone using initial rate method . A mixture was prepared which contained
acetone ,water, suphuric acid and iodine . A volume of 20 mL of the mixture was
transferred to a conical flask which was then titrated with sodium thiosulfate and was
done repeatedly four times at different time intervals. This experiment was done twice
but in the second one the concentration of acetone was doubled , In both experiments
performed , the volume of sodium thiosulfate was decreasing over time ,this was
because as the reaction was proceeding overtime the concentration of iodine was
decreasing as it was forming products
From the raw data obtained , the graph of concentration of iodine against time was
plotted and used to calculate the initial rate, these rates which had been calculated were
then used to determine the order in respect to acetone. The strategy used was to keep
the concentration of the other two reactants constant and see how the rate changes as
the concentration of the acetone is varied, the order in respect to acetone was then
found to be acetone.
BACKROUND
The rate of a chemical reaction is defined by the change of the concentration of
reactants or products over a period of time . An equation called the rate law expresses
the relationship of the reaction rate and the rate constant k , and the concentrations of
the reactants raised to x and y which are both determined experimentally. The rate law
is expressed as Rate =k[A]x[B]Y
The method of initial rates is used to calculate the rate order or law of a reaction in
which it can be performed experimentally . in this method , the chemical reaction whose
rate law is to be determined is run number of times while varying the initial
concentration of the species that are thought to appear in the rate law . The rate to
which a chemical reaction can occur depends on several factors which are
concentration of reactant whereby the rate increases as concentration also increases
due to more collisions , catalyst which speed up the rate by lowering the activation
energy and temperature of the system whereby the temperature is directly proportional
to the reaction rate.
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