Analytical Chem istry - DePauw University

654 Analytical Chemistry 2.0absorbancewavelength (nm) PAR Cu standard Zn standard mixture480 0.211 0.698 0.971 0.656496 0.137 0.732 1.018 0.668510 0.100 0.732 0.891 0.627526 0.072 0.602 0.672 0.498540 0.056 0.387 0.306 0.29026. The stoichiometry of a metal–ligand complex, ML n , was determined bythe method of continuous variations. A series of solutions was preparedin which the combined concentrations of M and L were held constantat 5.15 10 –4 M. The absorbances of these solutions were measured ata wavelength where only the metal–ligand complex absorbs. Using thefollowing data, determine the formula of the metal–ligand complex.mole fraction M mole fraction L absorbance1.0 0.0 0.0010.9 0.1 0.1260.8 0.2 0.2600.7 0.3 0.3890.6 0.4 0.5150.5 0.5 0.6420.4 0.6 0.7750.3 0.7 0.7710.2 0.8 0.5130.1 0.9 0.2530.0 1.0 0.00027. The stoichiometry of a metal–ligand complex, ML n , was determinedby the mole-ratio method. A series of solutions was prepared in whichthe concentration of metal was held constant at 3.65 10 –4 M, and theligand’s concentration was varied from 1 10 –4 M to 1 10 –3 M. Usingthe following data, determine the stoichiometry of the metal-ligandcomplex.[ligand] (M) absorbance1 .0 10 –4 0.1222 .0 10 –4 0.2513 .0 10 –4 0.3764 .0 10 –4 0.4965 .0 10 –4 0.6256 .0 10 –4 0.752