In order to determine the rate law for the reaction, you can carry out a series of reactions in which you change the concentration of one reactant at a time (dye, oxidant, and catalyst) relative to controlled trials. You can either double the concentration of a reagent (by replacing 0.50 mL of the water with an extra 0.50 mL of that reagent), or you can cut that reagent concentration in half (by using 1.25 mL of water and 0.25 mL of that reagent). The choice between these options is based on practical issues (the reaction should occur at a sufficient rate to observe, but not so fast that it is difficult to determine the initial rate reproducibly).

Use the buttons below to download the experimental data for the reaction of Red #40 with peroxide and Fe-TAML for different starting concentrations.