are &c. = = 5-18. Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol 36,400 and &Ni = 5520 at 510 nm and &c. = 1240 and EN 17,500 at 656 nm. A 0.425-g sample was dissolved and diluted to 50.0 mL. A 25.0-mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution had an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00-cm cell. Cal- culate the concentration in parts per million of cobalt and nickel in the sample. 26

EPR. Analyze the EPR spectrum below for Cu(TPP)a. Note that ligand splitting is not observed. (TPP = tetraphenylporphyrin) a. Label g, and gı. b. The geometry of the compound is square planar. Draw the compound and explain the multiplicity observed in the EPR spectrum. Cu (I = 3/2) 2500.00 2680.00 2860.00 3040.00 3220.00 3400.00 Magnetic Field (G) Intensity

The following data were obtained for a complex of nickel at 575 nm in a 1.00 cm cell. Using Microsoft Excel or some other graphing program, construct a calibration plot and accurately calculate the molar absorptivity (ε) for the nickel-complex at 575 nm. Standard # 1 2 3 4 A. 0.184 M-¹cm-1¹ B. 0.002 M-¹cm-¹ C. 5.425 M-¹cm-¹ Nickel Complex Concentration (M) 0.01 0.02 0.04 0.06 D. Not Enough Information to Determine Absorbance 0.058 0.109 0.220 0.328

Calculate the Conditional formation constant of 0.10 mol/L AIY in a solution of pH at 5.00 and with 0.010 mol/L auxiliary ligand F-. (IgB-lgB, of AIF: 6.15, 11.15, 15.00, 7.75, 19.36, 19.84; 1lgKAIY-16.3; at pH of 5.00: Igayan-6.45, IgaAKOH 0.4).