UCLA K302 Rate Law Determination of Crystal Violet Reaction Lab Questions

Expt: K-302 Rate Law Determination of Crystal Violet ReactionPost lab Questions:
1) Is the reaction of crystal violet with sodium hydroxide zero order, first order, or second order with
2) Determine the value of the rate constant k’ from the slope of the appropriate plot. Make sure you
include units.
3) The rate constant, k’, obtained from the slope of the appropriate plot (Q2), is called k’ because of the
conditions of the reaction that you performed where the concentration of hydroxide is so large that it
essentially remains constant (see Introduction section).
We know that: Rate = k [CV+]m [OH-]n
where [CV+] is the initial concentration of crystal violet,
and [OH-] is the initial molar concentration of hydroxide ions
And under the conditions of your experiment
Rate = k’ [CV+]m
where k’ = k [OH-]n
In Question 2 you have therefore determined the value of m (the reaction order for crystal violet) and k’
If you knew that the reaction is first order with respect to hydroxide ion, (n = 1) and that the initial
concentration of hydroxide ion in the reaction you performed is 0.010 M, calculate the value of k.
Remember to include units.
4) Based on your answers for Question 2 and Question 3, write the complete rate law expression for the
reaction of crystal violet and hydroxide ion. For your statement, assume that the reaction was carried
out at room temperature (approx. 25 deg. C)
5) Based on your value of k’ from Question 2, determine the half-life of the reaction in seconds.
Rate Law Determination of the Crystal Violet Reaction
-1.0
Linear Fit for Latest Ln Absorbance
Ln Abs – mtb
m (Slope): 0.08164
b(Y.Intercept) -0.7260
Correlation – 9999
RMSE 0 007720
-1.5
-2.0
5
15
20
0
(At 123 Ay 0.010)
10
Time (min)
imran 9232021 11:08 35
Rate Law Determination of the Crystal Violet Reaction
0.5
04
Linear Fit for Latest | Absorbance
Abs = mtb
m (Slope) -0.01858
b (Y-Intercept) 0.4257
Correlation-0.9777
RMSE 0.02461
0.3
02
0.1
0
5
10
15
20
Time (min)
Rate Law Determination of the Crystal Violet Reaction
10
Linear Fe for Latest 1/Absorbance vs time plot
Abs = mtb
m (Slope): 0.4124
b (Y-Intercent) 1 123
Correlation: 0.9783
RMSE 0 5390
5
15
10
Time (min)
Imran (1) 9/23/2021 11:13:37

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