KINETICS OF THE DECOLORIZATION OF CRYSTAL VIOLET BY SODIUM HYDROXIDE PRE-LABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. They are intended to introduce you to several ideas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be allowed to begin the experiment. 1. Complete the following table. Time (minutes) 0 3 6 9 12 Concentration of crystal violet, [R] 7.85 x 10-6 5.41 x 10-6 3.66 x 10-6 2.68 x 10-6 2.01 x 10-6 In[R*] Prepare three graphs using the attached graph paper: i) plot [R] (y-axis) versus time, ii) plot In[R] versus time, and iii) plot 1/[R] versus time. How do these three plots differ? Which is the most linear? 1/[R] 2. a. Write the equation which describes the reaction between crystal violet and hydroxide ion. b. A solution is prepared by mixing 25.0 mLs of 4.84 x 10 M crystal violet solution with 20.0 mLs of 0.10 M NaOH solution and diluted to a final volume of 100.0 mLs. Determine the limiting reagent. c. After the reaction has gone to completion, calculate the concentration of all species in the reaction. d. How does the concentration of sodium hydroxide change over the course of the reaction? e. Explain your answer in question 2d in terms of the initial concentrations of reactants.