Chris wants to study an organometal complex that was synthesized as shown below. Cr3+) + 2salenm Cr(salen), He first prepared the working standards by adding specific volumes of Cr3+ solution and added 5.00 ml of 0.500M salen and diluted the solutions to 32.0 ml. Th absorbance of each standard was then measured at the Amax, 425 nm, using a UV-Vis spectrophotometer as shown in the table below Table 1. Standardized solutions containing Cr(salen)". Concentration (M) Blank Absorbance 0.021 0.220 0.010 0.015 0.020 0.025 0.030 0.295 0.356 0.421 0.473 He then prepared an unknown solution by mixing 1.00-mL of 0.500 M Cr3+ with 2.00-mL of 0.500 M salen and diluting to 32.0 mL. The resulting mixture was found to have an absorbance of 0.285. A blank solution was run before analyzing the unknown and gave an absorbance of 0.015. А. Determine the best fit line (with r2) of the calibration curve. В. Calculate the equilibrium concentration (mM) of Cr3+ in the sample. С. Calculate the equilibrium concentration (mM) of salen in the sample. D. Determine the Keq of Cr(salen)23+ E. What is the color of the complex?
Chris wants to study an organometal complex that was synthesized as shown below. Cr3+) + 2salenm Cr(salen), He first prepared the working standards by adding specific volumes of Cr3+ solution and added 5.00 ml of 0.500M salen and diluted the solutions to 32.0 ml. Th absorbance of each standard was then measured at the Amax, 425 nm, using a UV-Vis spectrophotometer as shown in the table below Table 1. Standardized solutions containing Cr(salen)". Concentration (M) Blank Absorbance 0.021 0.220 0.010 0.015 0.020 0.025 0.030 0.295 0.356 0.421 0.473 He then prepared an unknown solution by mixing 1.00-mL of 0.500 M Cr3+ with 2.00-mL of 0.500 M salen and diluting to 32.0 mL. The resulting mixture was found to have an absorbance of 0.285. A blank solution was run before analyzing the unknown and gave an absorbance of 0.015. А. Determine the best fit line (with r2) of the calibration curve. В. Calculate the equilibrium concentration (mM) of Cr3+ in the sample. С. Calculate the equilibrium concentration (mM) of salen in the sample. D. Determine the Keq of Cr(salen)23+ E. What is the color of the complex?
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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Please answer Part C, and Part D. Thank you!
Transcribed Image Text:Chris wants to study an organometal complex that was synthesized as shown below.
Cr3+
+2salen) = Cr(salen), *
(a4)
He first prepared the working standards by adding specific volumes of Cr+ solution and added 5.00 ml of 0.500M salen and diluted the solutions to 32.0 ml. The
absorbance of each standard was then measured at the Amax, 425 nm, using a UV-Vis spectrophotometer as shown in the table below
Table 1. Standardized solutions containing Cr(salen)2*.
Concentration (M)
Blank
0.010
0.015
Absorbance
0.021
0.220
0,295
0.356
0.421
0.473
0.020
0.025
0.030
He then prepared an unknown solution by mixing 1.00-mL of 0.500 M Cr3+ with 2.00-mL of 0.500 M salen and diluting to 32.0 mL. The resulting mixture was
found to have an absorbance of 0.285. A blank solution was run before analyzing the unknown and gave an absorbance of 0.015.
А.
Determine the best fit line (with r2) of the calibration curve.
В.
Calculate the equilibrium concentration (mM) of Cr3+ in the sample.
С.
Calculate the equilibrium concentration (mM) of salen in the sample.
D.
Determine the Keq of Cr(salen),3
E.
What is the color of the complex?
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