Experiment 29

Use the experiment in the supplemental packet, not the lab

manual, for this experiment

CHE118 1

In Lab

• Work in groups of 4

• Do one trial run with everyone participating to observe the reaction and the data acquisition

• Divide the various trials among all four lab partners; exchange data

CHE118 2

Table 1(The only table with data)

• Volumes are given in the lab procedure; use a graduated cylinder to measure reactants

• The time for a completed trial should be written in units of seconds (whole numbers)

• Timers are provided in lab, or you can use your own timer

CHE118 3

Table 2

• Concentrations need to be calculated because the concentrated solutions are diluted when the reactants are mixed togetherUse the dilution equation (chapter 4 text)(Mc) (Vc) = (Md) (Vd)

The rate of reaction is: Rxn rate =(-)(1/a)(Δ[A]/Δt) = (-)(1/b)(Δ[B]/Δt) (Text, chp 14)

rxn rate = (-)(1/1)(Δ[I2]) / (Δt) (This is simplified in the table)

CHE118 4

Orders and k

1. Determine the exponents in the rate law equation:Rxn rate = k[acetone]m[H+]p[I2]n

2.Determine the value of k, the rate constant, for each trial and the average k value3.Calculate the reaction rate by using the completed equation and trial 5 data:Rxn rate = k[acetone]m[H+]p[I2]n

CHE118 5