A method different from the method of Job to determine the coordination number of a complex is to measure the shift in polarographic half-wave potential Ex of a metal ion M²* to more negative values during complex formation as a function of the concentration of the added ligand L. A good example is complex formation between Cd²+ and NH3 to which the equation E-(E), 0.0591, 2 [NH₂J/mol L¹ 0 E/V log [NHs] {Ex-(Ex)}/NV 0.0592 2 -log K-n- applies, where (E), is the half-wave potential of the free Cd²+ metal ion (i.e. in the absence of the ligand NH3), and K and n, as before, are the formation constant and coordination number of the resulting complex Cd (NH₂)2, respectively. Use the tabled values below and the supplied graph paper to determine the coordination number and molecular formula of the complex by plotting E-(E), versus log[NH,] and calculating n from the slope of the straight line graph. -0.752 3.14 log[NH,] -0.840 3.86 -0.856 4.75 -0.872 7.20 -0.904 8.86 -0.920
A method different from the method of Job to determine the coordination number of a complex is to measure the shift in polarographic half-wave potential Ex of a metal ion M²* to more negative values during complex formation as a function of the concentration of the added ligand L. A good example is complex formation between Cd²+ and NH3 to which the equation E-(E), 0.0591, 2 [NH₂J/mol L¹ 0 E/V log [NHs] {Ex-(Ex)}/NV 0.0592 2 -log K-n- applies, where (E), is the half-wave potential of the free Cd²+ metal ion (i.e. in the absence of the ligand NH3), and K and n, as before, are the formation constant and coordination number of the resulting complex Cd (NH₂)2, respectively. Use the tabled values below and the supplied graph paper to determine the coordination number and molecular formula of the complex by plotting E-(E), versus log[NH,] and calculating n from the slope of the straight line graph. -0.752 3.14 log[NH,] -0.840 3.86 -0.856 4.75 -0.872 7.20 -0.904 8.86 -0.920
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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![A method different from the method of Job to determine the coordination number of a complex
is to measure the shift in polarographic half-wave potential Ex of a metal ion M²* to more
negative values during complex formation as a function of the concentration of the added
ligand L. A good example is complex formation between Cd²+ and NH3 to which the equation
E-(E), =
0.0591
2
[NH3J/mol L-1 0
Ey/V
log [NH3]
{Ex-(Ex)s}/V
n=
applies, where (E₁), is the half-wave potential of the free Cd²+ metal ion (i.e. in the absence
of the ligand NH3), and K and n, as before, are the formation constant and coordination number
of the resulting complex Cd (NH3)², respectively. Use the tabled values below and the
supplied graph paper to determine the coordination number and molecular formula of the
complex by plotting E-(E), versus log[NH3] and calculating n from the slope of the
straight line graph.
formula:
0.0592
2
log K-n- -log[NH,]
-0.752
3.14
-0.840
3.86
-0.856
4.75
-0.872
7.20
-0.904
8.86
-0.920](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd2b36003-ef33-455c-bcff-0e6c40acbd92%2F5fe1396d-2c22-44a9-988f-8f3062c54b89%2Fa6grmlf_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A method different from the method of Job to determine the coordination number of a complex
is to measure the shift in polarographic half-wave potential Ex of a metal ion M²* to more
negative values during complex formation as a function of the concentration of the added
ligand L. A good example is complex formation between Cd²+ and NH3 to which the equation
E-(E), =
0.0591
2
[NH3J/mol L-1 0
Ey/V
log [NH3]
{Ex-(Ex)s}/V
n=
applies, where (E₁), is the half-wave potential of the free Cd²+ metal ion (i.e. in the absence
of the ligand NH3), and K and n, as before, are the formation constant and coordination number
of the resulting complex Cd (NH3)², respectively. Use the tabled values below and the
supplied graph paper to determine the coordination number and molecular formula of the
complex by plotting E-(E), versus log[NH3] and calculating n from the slope of the
straight line graph.
formula:
0.0592
2
log K-n- -log[NH,]
-0.752
3.14
-0.840
3.86
-0.856
4.75
-0.872
7.20
-0.904
8.86
-0.920
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