Question

Ligand X Forms....

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 0.238-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 0.497 at 510 nm and 0.363 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 below. What is the concentration of cobalt and copper in the final diluted solution? [Co^2+ = [cu^2+] = What is the weight percent of cobalt (FM = 58.933 g/mol) and copper (FM = 63.546 g/mol) in the 0.238 -g sample wt% Co^2+ = wt% Cu^2+ =

Answer 1

at 645 nm' Eco 3621 Eco = 12.54 A = 0.363 at-645 5 Co 04x105 x 100 = c,K 50 C2- 2-14x10 Co = 2-14x10-M ら