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 solutioncontaining ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. Themeasured 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+] =5106453.125 x10-5IncorrectCo2.867 x10-53.7630 x 10²What is the concentration of cobalt and copper in the final diluted solution?1282Cu570718090MM

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What is the concentration of cobalt and copper in the final diluted solution?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds

Section: Chapter Questions

Problem 105QRT

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Question

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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