Name SectionCRN- KINETICS OF THE DECOLORIZATION OF CRYSTAL VIOLET BY SODIUM HYDR

ID: 561816 • Letter: N

Question

Name SectionCRN- 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 I. Complete the following table. Time (minutes) Concentration of In R'I 1/IR' crystal violet, IR1 5.52 x 10 4.25 x 10 3.32x 10 2.61 x 10 12 2.02 x 10 Prepare three graphs using the attached graph paper i) plot [R'](y-axis) versus time, ii) plot In[R 1 versus time, and ii) plot I/TR'1 versus time How do these three plots differ? Which is the most linear? 2. a. Write the equation which describes the reaction between crystal violet and hydroxide ion. CHEM1515-YEAR 2017-2018 11-1

Explanation / Answer

Time (min)

Concentration of crystal violet, [R+]

ln [R+]

1/[R+]

5.52*10-6

-12.1071

181159.42

4.25*10-6

-12.3686

235294.12

3.32*10-6

-12.6155

301204.82

2.61*10-6

-12.8562

383141.76

2.02*10-6

-13.1124

495049.50

(i) Plot [R+](*10-6) vs time as below.

(ii) Plot ln [R+] vs time as below.

(iii) Plot 1/[R+] vs time as below.

The plot of ln [R+] vs time is the most linear with R2 value almost equal to 1.000 (ans).