Chris wants to study an organometal complex that was synthesized as shown below.Cr3++ 2salen) = Cr(salen),³He first prepared the working standards by adding specific volumes of Cr3+ solution and added 5.00 mlof 0.500M salen and diluted the solutions to 32.0 ml. The absorbance of each standard was thenmeasured 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)BlankAbsorbance0.0210.0100.0150.2200.2950.0200.0250.3560.4210.4730.030He then prepared an unknown solution by mixing 1.00-ml of 0.500 M Cr3+ with 2.00-ml of 0.500 Msalen and diluting to 32.0 mL. The resulting mixture was found to have an absorbance of 0.285. A blanksolution was run before analyzing the unknown and gave an absorbance of 0.015.A. Determine the best fit line (with r) of the calibration curve.B. Calculate the equilibrium concentration (mM) of Cr3+ in the sample.c. Calculate the equilibrium concentration (mM) of salen in the sample.D. Determine the Keq of Cr(salen);"E. What is the color of the complex?

An equilibrium reaction is expressed as: Reactants⇌Products The equilibrium constant for this…

A. Determine the best fit line (with r) of the calibration curve. B. Calculate the equilibrium concentration (mM) of Cr3+ in the sample. C. Calculate the equilibrium concentration (mM) of salen in the sample. D. Determine the Keq of Cr(salen);* E. What is the color of the complex?

A. Determine the best fit line (with r) of the calibration curve. B. Calculate the equilibrium concentration (mM) of Cr3+ in the sample. C. Calculate the equilibrium concentration (mM) of salen in the sample. D. Determine the Keq of Cr(salen);* 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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Question

Chris wants to study an organometal complex that was synthesized as shown below.
Cr3+
+ 2salen) = Cr(salen),³
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. 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);".
Concentration (M)
Blank
Absorbance
0.021
0.010
0.015
0.220
0.295
0.020
0.025
0.356
0.421
0.473
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.
A. Determine the best fit line (with r) of the calibration curve.
B. Calculate the equilibrium concentration (mM) of Cr3+ in the sample.
c. Calculate the equilibrium concentration (mM) of salen in the sample.
D. Determine the Keq of Cr(salen);"
E. What is the color of the complex?

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