The Activation Energy of Bromide ion and Bromate ion
To Determine the Activation Energy of the Reaction between Bromide
ion and Bromate (V) ion in Acid Solution
Objectives:
By reacting Potassium Bromide and Potassium Bromate in the acid
solution in varies temperature, we can then determine the Activation
Energy of the reaction in different temperature through the equation:[IMAGE].
Questions:
1. Give an equation for the reaction between phenol and bromine.
2. What is the use of methyl orange in this experiment?
The methyl orange is used as an indicator for the reaction. Bromine
will be produces during the reaction and it will react with phenol
rapidly. Once all the phenol is used up, further bromine produced will
bleach the methyl orange immediately. So the rate of the reaction can
be calculated from the time for the indicator to be decolorized.
3. Based on your results, is it advisable to perform the experiment at
high temperatures such as 80℃?
From the above results, the time of the reaction is shorter as the
experiment temperature increase. So it is not advisable to perform the
experiment at high temperatures as the time of reaction is too short,
it is not easy for us to record.
4. Why is it not necessary to know how far the reaction has proceeded
at the point where the methyl red is decolourized?
In the experiment, the number of mole and the molarity of each
chemicals used are the same. And the appearance of the pink colour
only determines that there are some content of the reaction has
processed. As the result, it is only necessary for us to compare the
time required for the reaction mixture to reach the point the
decolourization occurs at different temperature.
5. The Arrhenius equation can be represented as:
(a) Can substitute k in this equation? Why?
Can substitute k in this equation. As in the above experiment,
the initial rate can be represented by due to the constant
concentration of the reactants. Also the rate constant k is
proportional to the rate of the reaction when the temperature changes.
Input variables In this experiment there are two main factors that can affect the rate of the reaction. These key factors can change the rate of the reaction by either increasing it or decreasing it. These were considered and controlled so that they did not disrupt the success of the experiment. Temperature-
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