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4. A light pink, 0.050 M stock solution of cobalt (II) chloride (COCL) is analyzed by Spectrophotometry. The cuvettes are 1.0 cm wide. The data from the Absorption Spectrum of CoCl,(aq) spectrograph is plotted here. 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 (a) Analyze the graph above. (i) Estimate the wavelength you would use to study the concentration of this solution What is the absorbance at this wavelength? (ii) 200 300 400 500 600 700 800 Wavelength (nm) (b) From your various estimates and the given information, calculate the molar absorptivity (E) of Co2 ions in solution. Absorbance

4. A light pink, 0.050 M stock solution of cobalt (II) chloride (COCL) is analyzed by Spectrophotometry. The cuvettes are 1.0 cm wide. The data from the Absorption Spectrum of CoCl,(aq) spectrograph is plotted here. 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 (a) Analyze the graph above. (i) Estimate the wavelength you would use to study the concentration of this solution What is the absorbance at this wavelength? (ii) 200 300 400 500 600 700 800 Wavelength (nm) (b) From your various estimates and the given information, calculate the molar absorptivity (E) of Co2 ions in solution. Absorbance

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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( Waich 4. A light pink, 0.050 M stock solution of cobalt (II) chloride (C0CL) is analyzed by Spectrophotometry. The cuvettes are 1.0 cm wide. The data from the Absorption Spectrum of CoCl,(aq) spectrograph is plotted here. 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 (a) Analyze the graph above. (i) Estimate the wavelength you would use to study the concentration of this solution What is the absorbance at this wavelength? (ii) 0,1 0.05 200 300 400 500 600 700 800 Wavelength (nm) (b) From your various estimates and the given information, calculate the molar absorptivity (ɛ) of Co2* ions in solution. the right (c) Suppose this 0.05 M stock solution was left on the counter, open, overnight before generating the results above. How would this affect any results from some other experiment, where this stock solution was used as a standard to find an unknown Co2* concentration? (d) Solutions of transition metals are colorful when ions in solution have unpaired d-electrons. Justify that when cobalt loses two valence electrons to form Co* ions, that this condition has been met. dw the inol n he d n with owig howa wstor molecle mght bewre ) Absorbance
Transcribed Image Text:( Waich 4. A light pink, 0.050 M stock solution of cobalt (II) chloride (C0CL) is analyzed by Spectrophotometry. The cuvettes are 1.0 cm wide. The data from the Absorption Spectrum of CoCl,(aq) spectrograph is plotted here. 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 (a) Analyze the graph above. (i) Estimate the wavelength you would use to study the concentration of this solution What is the absorbance at this wavelength? (ii) 0,1 0.05 200 300 400 500 600 700 800 Wavelength (nm) (b) From your various estimates and the given information, calculate the molar absorptivity (ɛ) of Co2* ions in solution. the right (c) Suppose this 0.05 M stock solution was left on the counter, open, overnight before generating the results above. How would this affect any results from some other experiment, where this stock solution was used as a standard to find an unknown Co2* concentration? (d) Solutions of transition metals are colorful when ions in solution have unpaired d-electrons. Justify that when cobalt loses two valence electrons to form Co* ions, that this condition has been met. dw the inol n he d n with owig howa wstor molecle mght bewre ) Absorbance
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