Crystal Violet Decolorization Lab

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Chemistry 102L Data Summary
EXPT.
Kinetics of Crystal Violet Decolorization
14

Your name:
Madison Rex
Lab Section 423
Your partner’s name
Diane Ramirez
Date
4/5/17

RESULTS

Observations
The cuvets were labeled 1-5, 1 being completely transparent and 5 being very dark purple. Cuvets 2-4 gradually increased from light to dark purple. All of the standard stock cuvets and kinetic trial were filled with 3500μL of solution; therefore, the level of liquid in each cuvet was even. When the standard stock cuvets were placed into the colorimeter, no reaction took place and no color change occurred. However, when the NaOH was added to the kinetic trial cuvets, a reaction between the crystal violet and the NaOH took place. Because of this, when the cuvets were removed from the colorimeter, they were significantly more transparent than when they were inserted into the colorimeter. Table 1. Standard Stock Solution Data
Cuvette
Molarity of Standard (M)
Volume of Standard (μL)
Molarity of Stock (M)
Volume of Stock (μL)
Volume of D.I. Water (μL)
1
0.000
3500
1.5 x 10-5
0.000
3500
2
3.63 x 10-6
3500
1.5 x 10-5
850
2650
3
7.71 x 10-6
3500
1.5 x 10-5
1800
1700
4
1.11 x 10-5
3500
1.5 x 10-5
2600
900
5
1.5 x 10-5
3500
1.5 x 10-5
3500
0.000

Figure 1. …show more content…
Each reactant concentration has a respective order determined by the contribution the reactant is making to the rate of the entire reaction. The overall reaction order for this experiment was one. The rate at which NaOH was reacting remained unchanged, making it a zero order reaction. The calculated exponential y value for the concentration of crystal violet was 0.853. This was rounded to 1.00 which makes the concentration of crystal violet a first order reaction. This aligns with the large R2 value of figure 3 which estimates the overall reaction order to be
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