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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![Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm.
respectively. A 0.243 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution
containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The
measured absorbance of the unknown solution was 0.503 at 510 nm and 0.368 at 645 nm, when measured with a 1.00 cm cell.
The molar absorptivities of the cobalt and copper complexes at each wavelength are shown in the table.
Molar Absorptivity (c. M-'cm-¹)
Wavelength
[Co² =
A, nm
[Cu²+] =
510
645
3.125 x10-5
Incorrect
Co
2.867 x10-5
3.7630 x 10²
What is the concentration of cobalt and copper in the final diluted solution?
1282
Cu
5707
18090
M
M](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd55d6915-7b2d-4b6a-a3ee-98c8dde8390b%2Fe0457db1-3010-42a7-97b9-22b02cbcb046%2Frlvi7cl_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm.
respectively. A 0.243 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution
containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The
measured absorbance of the unknown solution was 0.503 at 510 nm and 0.368 at 645 nm, when measured with a 1.00 cm cell.
The molar absorptivities of the cobalt and copper complexes at each wavelength are shown in the table.
Molar Absorptivity (c. M-'cm-¹)
Wavelength
[Co² =
A, nm
[Cu²+] =
510
645
3.125 x10-5
Incorrect
Co
2.867 x10-5
3.7630 x 10²
What is the concentration of cobalt and copper in the final diluted solution?
1282
Cu
5707
18090
M
M
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