Solution A: KIO3 in H2O
Solution B: NaHSO3 in H2O
Starch Solution
This is a lab where we will basically determine a rate law. To get an idea of how this experiment will proceed I combined 1 mL of Solution A, 1 mL of Solution B, and four drops of starch. I shook it to mix everything up and then watched the solution for one minute. All of a sudden it turned dark blue! Here is the video.
In this experiment we want to find the order with respect to A and with respect to B. That means we must do at least three experiments. The rate of turning blue will be what we use as the initial rate in our data table, so we will find out how long it takes before the solution turns blue. Here is the table of volumes used and times for each experiment. Think of the volumes like the number of corks in the previous experiment.
| Expt # | mL A | mL B | mL Water | Average Time to Go Blue |
| Expt #1 | 1.0 | 1.0 | 1.0 | 58 sec |
| Expt #2 | 1.0 | 2.0 | 0.0 | 29 sec |
| Expt #3 | 2.0 | 1.0 | 0.0 | 41 sec |
Here is the third experiment:
Determine the order of A and of B and email me your result with a detailed description of how you obtained the orders. I am looking for the rate law orders. What are the x and y in the rate law? You do not need to give +/- values for this lab. This will count as one lab assignment.