**Background:**

This experiment allows the student to perform the classic iodine
clock kinetics reaction. The student prepares solutions of the
various reagents to evaluate the reaction rate dependence on iodide
concentration. Students calculate the concentrations of all species
and monitor with a timer each reaction's time to observe the
appearence of blue starch color. Students perform a linear
regression analysis using s log-log plot of rate vs concentration
to determine the power of the iodide term in the rate law.
The student discusses various sources of error in the experiment
and predicts expected outcomes for new conditions.

**Learning Objectives:**

- Prepare and carry out four trials using the correct combination
of available reagent solutions.
- Be able to calculate the concentration of each species in each
reaction when different additive volumes and initial concentrations
are combined.
- Plot e log[rate] versus log[conc] relationship and obtain the
slope, yielding the rate law dependence.Use a spreadsheet to
perform a linear regression analysis.
- Be able to discuss the possible sources of error and predict
behavior when conditions are altered.