a. Calculate for the concentrations of the five standard solutions. b. Give the equation of the line and r2 value of the calibration curve. c. What is the molar absorptivity of [FeX3]2+?
a. Calculate for the concentrations of the five standard solutions. b. Give the equation of the line and r2 value of the calibration curve. c. What is the molar absorptivity of [FeX3]2+?
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
Section17.6: Equilibria Involving Complex Ions
Problem 1.3ACP: Use the formation constant of [Au(CN)2] in Appendix K to determine the equilibrium concentration of...
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a. Calculate for the concentrations of the five standard solutions.
b. Give the equation of the line and r2 value of the calibration curve.
c. What is the molar absorptivity of [FeX3]2+?
![Ferrous ion reacts with an unknown ligand X to form a bright red complex with Amax = 512
nm.
Fe2"(a«) + 3X{a9) = [FeX3]²*(a«)
A standard stock solution of Fe2+ of 1.00 x 10-3 M concentration was initially prepared.
Then, five (5) 100-mL standard solutions of [FeX3]²*(aq) of varying concentrations were
prepared by taking aliquots from the standard stock solution, adding 10.0 mL of ligand X
solution, and diluting it to 100-mL. The volumes of the standard stock solutions and their
corresponding absorbances recorded with a path length of 0.50 cm at its Amax are
recorded below:
Table 5. UV-Vis data of [FeX3]2+ complex standards
Volume of Fe2+ stock, mL
Absorbance
1.00
0.079
2.00
0.165
3.00
0.255
4.00
0.359
5.00
0.447](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F55815ef3-1f3f-422e-b33b-6261d3029e90%2Feaa360a6-49ba-437f-b25c-005b16982f3d%2Fgkqp7l_processed.png&w=3840&q=75)
Transcribed Image Text:Ferrous ion reacts with an unknown ligand X to form a bright red complex with Amax = 512
nm.
Fe2"(a«) + 3X{a9) = [FeX3]²*(a«)
A standard stock solution of Fe2+ of 1.00 x 10-3 M concentration was initially prepared.
Then, five (5) 100-mL standard solutions of [FeX3]²*(aq) of varying concentrations were
prepared by taking aliquots from the standard stock solution, adding 10.0 mL of ligand X
solution, and diluting it to 100-mL. The volumes of the standard stock solutions and their
corresponding absorbances recorded with a path length of 0.50 cm at its Amax are
recorded below:
Table 5. UV-Vis data of [FeX3]2+ complex standards
Volume of Fe2+ stock, mL
Absorbance
1.00
0.079
2.00
0.165
3.00
0.255
4.00
0.359
5.00
0.447
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