The “iodine clock” reaction involves the mixing of two colorless solutions to produce a solution which remains colorless for a precise amount of time, then suddenly changes to a deep purple-blue color (as seen in the demonstration below). The time is controlled by the temperature and/or the concentrations of the reactants.
The reaction you will study involves the oxidation of iodide ion (I-) to dissolved tri-iodide ion (I3-):
6 H+ + IO3- + 8 I- →→ 3 I3- + 3 H2O
Triiodide ion combines with starch indicator to produce the characteristic purple-blue color. Timing how long it takes for the blue color to appear allows the rate of the reaction to be measured.
In this lab simulation, your goals will be to:
Download lab instructions for carrying out this experiment as either aor file.
These instructions contain an extensive background explaining the basis for the iodine clock reaction and how to use an online lab simulation (Links to an external site.) of the iodine clock reaction (provided by Prof. Gary Bertrand, Missouri University of Science and Technology) to collect experimental data. They also contain details of how to analyze the data to determine the rate law and other kinetic parameters.
When you have completed the experimental analysis you will answer a set of postlab questions included in the instructions file.
You should also consult the relevant segments of Chapter 14 for background and guidance as follows:
Goal 1: Module 5 Determining Rate Laws: Initial Rates Method
Goal 2: Module 6 Collision Theory, Activation Energy, Temperature and Catalysts
Goal 3: Module 6 Reaction Mechanisms
The lab instructions also explain what you need to do to prepare a lab report for submission.
When you have completed this assignment and are ready to submit your lab report, click the “Submit Assignment” button at the top of this page and use the options available to upload your file. Remember to click “Submit”. The due date is Sunday March 21st at 11:59 pm.
If you need help, or have not submitted an assignment in Canvas before, check out this assignments help video.
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