Chemistry Lab: Ferrate Both Weeks College General Chemistry Assignment

692 words - 3 pages

Experiment 6: Ferrate
Mason Ostrowski
Alexis, Marcello
April 3, 2018
Hilda Posada
Section 3
PROCEDURE
The procedure was followed as written:
Week 1/2
1. Calibrate spectrometer with DI water. Follow instructions for calibration from part 2.
2. Measure 1.5mL of DTZA in graduated cylinder
3. Measure 3 mL of ferrate in another graduated cylinder
4. Transfer ferrate to graduated cylinder with DTZA and immediately transfer to cuvette.
5. Shake cuvette for 5 min the place in spectrometer.
6. Record absorbance at every 30 seconds for 5 minutes
7. Discard ferrate and DTZA solution
8. Repeat process for trial 2 using same amount of ferrate and 3 mL of DTZA. If there is time for trial 3, use 4.5 mL of DTZA.
RESULTS
Table 1: Data Values to Calculate the Concentration of Ferrate
Sample
Absorbance at 510 nm
Diluted Conc. of Ferrate (M)
Stock Concentration of Ferrate (M)
Trial 1
.895
7.78
1.56
Trial 2
.644
1.12
Table 2: Percent Yield of Ferrate Produced
Actual Yield of Ferrate Concentration (M)
1.34
Theoretical Yield of Ferrate Concentration (M)
8.3
Percent Yield
16.14%
Sample Calculations:
Theoretical yield:
Actual yield = stock concentration (T 1) + stock concentration (T 2) /2
Percent yield= actual yield/theoretical * 100%
Table 3: Performing the Reaction between Ferrate and Diatrizoic Acid (DTZA) (Week 1)
Time (sec)
1st Reaction
Absorbance at 509.5 nm
Time (sec)
2nd Reaction
Absorbance at 509.5 nm
Time (sec)
Table for additional reaction if needed
Reaction Absorbance at 510 nm
0
.333
0
.164
30
.341
30
171
60
.314
60
167
90
.288
90
.111
120
.281
120
.105
150
.279
150
.101
180
.274
180
.096
210
.269
210
.052
240
.268
240
.051
270
.264
270
.050
300
.260
300
.053
Figure 1: 1st Reaction between Ferrate and 0.040 M DTZA (Week 1)
Figure 2: 2nd Reaction between Ferrate and 0.040 M DTZA (Week 1)
Table 4: Performing the Reaction between Ferrate and Diatrizoic Acid (DTZA) (Week 2)
Time (sec)
1st Reaction
Absorbance at 510 nm
Time (sec)
2nd Reaction
Absorbance at 510 nm
Time (sec)
Table for additional reaction if needed
Reaction Absorbance at 510 nm
0
.362
0
.363
30
.257
30
.422
60
.244
60
.305
90
.236
90
.230
120
.228
120
.216
150
.225
150
.205
180
.225
180
.199
210
.225
210
.192
240
.233
240
.188
270
.241
270
.183
300
.257
300
.183
Figure 3: 1st Reaction between Ferrate and 0.10 M DTZA (Week 2)
Figure 4: 2nd Reaction between Ferrate and 0.10 M DTZA (Week 2)
Analysis of results:
The rate of reactions between week one and two contrasted each other. As the dye concentration decreased in week two, the slope of the lines best fit decreased as well. Diluting the concentrations seemed to make the line of best-fit stay with the graph better than how it was in week two. We also found out that DTZA and ferrate concentration are inverses with each other.
DISCUSSION
Research Question and Purpose of Research: What effects will the concentration of DTZA have an effect between the reaction of DTZA and ferrate.
Independent Variable: Keep ferrate concentration constant
Dependent Variable: Rate of reaction between ferrate and DTZA.
Control Variable: The dye
Hypothesis: As the concentration of DTZA increases, the rate of the reaction decreases.
Correlation of data and hypothesis: As the DTZA was either diluted or concentrated, the line of best fit will also follow the DTZA to see if it increases or decreases. The ferrate and DTZA went back and forth because when the DTZA increased, ferrate decreased and vice versa.
REFLECTION
I was the manager of my group for this experiment. I explained them the procedure and got the materials we would need for the lab. My partners, Alexis and Marcello, were great; they performed the reactions, and used the labquest tool without any issues. Limitations in this experiment were the solutions not being completely accurate. To change this, we used a pipette to try and get closer values to what we need and the right amount. Although using the pipette worked, using a syringe may produce better results because it won’t leave any drops behind.

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