George Mason University Crystal Violet Dye Reaction Order Lab Report

Make the three graphs below on excel, Include a picture of the excel graphs on a word doc as well because my excel is old.

After consulting the table of reaction orders and their attributes, the order of the crystalviolet dye should make itself apparent if, after collecting the absorbance and time data, threegraphical plots are prepared for each trial:

• One graph of absorbance vs. time

• One graph of ln(absorbance) vs. time

• One graph of 1/absorbance vs. time

Only one type of these plots should be a straight line. This is therefore a direct, graphicaldetermination of the order of reaction with respect to crystal violet dye.

Discussion:

1. What is the order of the reactant crystal violet?

2. Compare the values for slope from the linear graphs you obtained. Does there appear to be any trendyou can spot when comparing these two slopes and the change in concentration of hydroxide ion?Rates of reaction should be proportional to observed values for k.

3. In general, which of the two concentrations reached the 90% mark more quickly? State any trend thatstands out.

4. The starting concentration (time zero) of crystal violet is 1 x 10-4 M. Using the proper integratedrate law and the calculated value for k, calculate the concentration of crystal violet after 240 seconds.

5. Use the y-intercept from your straight line to obtain a value for e0, the extinction coefficient, forcrystal violet at time zero. Use the Beer-Lambert Law to do this.

Data Table: Chemical kinetics: Crystal Violet Dye

Concentration of NaOH solution	0.0251 NaOH
Concentration of Crystal Violet Dye Solution	0.001M
Room Temperature (assumed to be reaction temperature)
Trial #1		Trial #2
Time (sec)	%T	Time (min)	%T
30	0.970	30	1.019
60	0.861	2	0.913
90	0.767	90	0.809
120	0.676	120	0.716
150	0.590	150	0.624
180	0.516	180	0.540
210	0.444	210	0.467
240	0.383	240	0.402
270	0.327	270	0.344
300	0.280	300	0.297
330	0.239	330	0.255
360	0.206	360	0.219
390	0.173	390	0.189
420	0.150	420	0.165
450	0.131	450	0.146

Data Table continued

Concentration of NaOH solution	0.05051
Concentration of Crystal Violet Dye Solution	0.001M
Room Temperature (assumed to be reaction temperature)
Trial #1		Trial #2
Time (sec)	%T	Time (min)	%T
30	1.025	30	0.471
60	1.020	60	0.372
90	1.021	90	0.294
120	1.018	120	0.232
150	1.016	150	0.182
180	1.014	180	0.140
210	1.012	210	0.109
240	1.008	240	0.085
270	1.006	270	0.067
300	1.001	300	0.052
330	0.998	330	0.042
360	0.993	360	0.031
390	0.991	390	0.025
420	0.989	420	0.020
450	0.986	450	0.016

Also Include 1-5 sentences that briefly summarize the procedureand what information was obtained

? Example:– ____ g (or mL) of Reagent A were reacted with _____ g (or mL) ofReagent B until a precipitate formed/gas evolved/color changeoccurred. Observations were made and data were collected. Table 1represents _____. Table 2 represents _____. Figure 1 represents_____. Figure 2 represents ____.

and include a conclusion:

Restate the purpose of the experiment

? How did you attempt to meet the purpose?

? Was the purpose met?

? Restate the anticipated outcome. Was the actual outcome close tothe anticipated outcome?

? Why or why not? What errors did you specifically experience inthis experiment?– Distance-learning format of the class is not an error

? What are some future improvements to this experiment?– “Updating the lab manual”, “clear/better instructions onhow to perform calculations”, “instructor not explaining thelab procedure”, “do not make the class a distance-learningcourse”, etc. are NOT future improvements

Let me know if you have any questions!

lab report below pages 186-194