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# George Mason University Crystal Violet Dye Reaction Order Lab Report

George Mason University Crystal Violet Dye Reaction Order Lab Report.

I’m studying for my Chemistry class and don’t understand how to answer this. Can you help me study?

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 crystal
violet dye should make itself apparent if, after collecting the absorbance and time data, three
graphical 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, graphical
determination 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 trend
you 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 that
stands out.

4. The starting concentration (time zero) of crystal violet is 1 x 10-4 M. Using the proper integrated
rate 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, for
crystal 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 procedure
and what information was obtained

■ Example:
– ____ g (or mL) of Reagent A were reacted with _____ g (or mL) of
Reagent B until a precipitate formed/gas evolved/color change
occurred. Observations were made and data were collected. Table 1
represents _____. 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 to
the anticipated outcome?

■ Why or why not? What errors did you specifically experience in
this 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 on
how to perform calculations”, “instructor not explaining the
lab procedure”, “do not make the class a distance-learning
course”, etc. are NOT future improvements

Let me know if you have any questions!

lab report below pages 186-194

George Mason University Crystal Violet Dye Reaction Order Lab Report

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