The rate law for our reaction is rate = k [dye]x[bleach]y, where you identified x in the previous step. In order to find the value of y, we can look at the pseudo-rate of reaction k' = k [bleach]y . With this notation, our rate is now rate = k' [dye]x .
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Use the pipet to dispense between 9.00 mL and 9.90 mL of dye into the vial.
Place the vial into the spectrometer and add the stirrer.
Use the 1 mL syringe to add the needed amount of the 0.090 M bleach solution to the vial in order to reach a total reaction mixture volume of 10.00 mL.
Cover the vial with the black lid to start the measurement.
Once the measurement is complete, inspect the three plots generated (absorbance vs. time, ln(absorbance) vs. time, 1/absorbance vs. time) and choose the one that is most useful in determining the pseudo-rate constant. Input your name, lab section (under lab ID), and an informative graph title (including the quantities and bleach concentrations tested) and save (print) the plot.
Repeat the experiment using the same amounts of yellow dye and bleach solution as before, but this time use the 0.180 M bleach solution. Print the relevant plot.
Use the two saved plots to compute the two corresponding pseudo-rate constants. Knowing that the rate constant for the reaction k is the same, use the two computed values to determine the order of the reaction with respect to the bleach.