Question & Answer: In the Rate of an Iodine Clock Reaction experiment, the following data were collected by a…..

In the Rate of an Iodine Clock Reaction experiment, the following data were collected by a student: Write down the Equation of the reaction under study and calculate the order of the reaction. following data were collected by a student:

The balanced chemical equation is

$2NaI + K_2S_2O_8 \rightarrow I_2 + Na_2SO_4 + K_2SO_4$

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From first and third experiments, when $[ K_2S_2O_8 ]$ is kept constant and [NaI] is doubled, the time of the reaction is reduced to one half from 162s to 82s. This indicates that the rate of the reaction is doubled. Hence, the order of the reaction with respect to NaI is 1.

From first two experiments, when [NaI] is kept constant and $[ K_2S_2O_8 ]$ is doubled, the time of the reaction is reduced to one half from 162s to 84s. This indicates that the rate of the reaction is doubled. Hence, the order of the reaction with respect to $K_2S_2O_8$ is 1.

Hence, the overall order of the reaction is $1+1=2$.