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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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?
Transcribed Image Text: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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