Difference Between Acetone And Iodine

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Discussion In this experiment, the chemical reaction between acetone (CH3COCH3) and iodine (I2) to make CH3COCH2I, I-, and H+ was observed. Under normal circumstances, this reaction would occur very slowly. In order to speed up the process, hydrochloric acid (H+) was used as a catalyst. A catalyst is a substance that can speed up a reaction by lowering the activation energy of the reaction. It does this by changing the mechanism of the reaction and providing more energetically favorable elementary steps that would otherwise not exist without its presence. In addition, a catalyst does not get used up in the reaction. In this case, hydrochloric acid reappears in the products of the reaction because it does not get consumed. Hydrochloric acid …show more content…
Once the acetone was diluted, its molarity needed to be found in order to calculate its concentration in the overall solution. The density of acetone is 0.791 g/mL. Using dimensional analysis, the density was converted to moles per liter, otherwise known as molarity (sample calculation 1). Then the C1V1=C2V2 equation was used to calculate the molarity of the acetic acid in the dilute solution (sample calculation 2). The molarities of the hydrochloric acid and the iodine were already given. In order to determine the values of the exponents in the rate law equation, the reactant concentrations of acetone and hydrochloric had to be varied so that their effect of the reaction rate could be observed. In trial 1, the concentrations of hydrochloric acid and acetone were kept equal at 0.8 mL of both. In trial 2, the concentration of the hydrochloric acid was doubled and in trial 3 it was tripled. In trial 4, the concentration of acetone was doubled and in trial 5 it was tripled. In all of these trials, only one concentration was manipulated at a time. For example, if the concentration of acetone was being doubled or tripled, then the concentration of hydrochloric acid would be kept constant (refer to Table 1). This was done so that the effect of only one reactant concentration on the rate was observed at a time. If more than one variable was manipulated at a time, it would not be clear which one was affecting the rate change. Distilled water was added to make up the difference in volumes so that each cuvette would have 4mL of liquid in it and the volume would be constant. It is very important to make sure other factors in experiments as kept constant so that only one variable is being measured at a time and to ensure that differences would not be due to changes in volume. As mentioned before, iodine can be used as an indicator to tell when the reaction has stopped occurring because

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