Application Questions: Answer the following questions. Show all work for calculations and include units and the correct number of significant figures. 1. A solution of cobalt (III) chloride was analyzed using a UV/Vis spectrometer and produced the spectra shown in Fig. 4. What is the best wavelength to use for analyzing the samples? Best wavelength to analyze sample: Absorbance 0.600 0.500 0.400 0.300 0.200 0.100 0.000 375 400 450 425 475 500 525 550 Wavelength (nm) Molarity of FD&C #2 0.000 0.115 0.225 0.350 575 Figure 4. UV/Vis spectra of a cobalt (III) chloride solution for determination of the best wavelength for analysis. 8 600 625 2. Create a graph in Excel and add a linear trendline using the data given below. Calculate the molarity of a solution (to 3 significant digits) with an absorbance of 0.576 using the trendline equation from this graph. Show your work in the box below. DO NOT ATTACH THE FIGURE. Abs 0.002 0.187 0.442 0.699 650 675

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Application Questions: Answer the following questions. Show all work for calculations and
include units and the correct number of significant figures.
1. A solution of cobalt (III) chloride was analyzed using a UV/Vis spectrometer and produced the
spectra shown in Fig. 4. What is the best wavelength to use for analyzing the samples?
Best wavelength to analyze sample:
Absorbance
0.600
0.500
0.400
0.300
0.200
0.100
0.000
375
400
450
425
475
500 525 550
Wavelength (nm)
Molarity of
FD&C #2
0.000
0.115
0.225
0.350
575
Figure 4. UV/Vis spectra of a cobalt (III) chloride solution for determination of the best
wavelength for analysis.
8
600 625
2. Create a graph in Excel and add a linear trendline using the data given below. Calculate the
molarity of a solution (to 3 significant digits) with an absorbance of 0.576 using the trendline
equation from this graph. Show your work in the box below. DO NOT ATTACH THE
FIGURE.
Abs
0.002
0.187
0.442
0.699
650
675
Transcribed Image Text:Application Questions: Answer the following questions. Show all work for calculations and include units and the correct number of significant figures. 1. A solution of cobalt (III) chloride was analyzed using a UV/Vis spectrometer and produced the spectra shown in Fig. 4. What is the best wavelength to use for analyzing the samples? Best wavelength to analyze sample: Absorbance 0.600 0.500 0.400 0.300 0.200 0.100 0.000 375 400 450 425 475 500 525 550 Wavelength (nm) Molarity of FD&C #2 0.000 0.115 0.225 0.350 575 Figure 4. UV/Vis spectra of a cobalt (III) chloride solution for determination of the best wavelength for analysis. 8 600 625 2. Create a graph in Excel and add a linear trendline using the data given below. Calculate the molarity of a solution (to 3 significant digits) with an absorbance of 0.576 using the trendline equation from this graph. Show your work in the box below. DO NOT ATTACH THE FIGURE. Abs 0.002 0.187 0.442 0.699 650 675
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The best wavelength to use for analyzing the samples is the wavelength at which the absorbance is maximum. 

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