3. Using the graph provided, find the concentration of a solution that had an absorption of 0.269 when measured at 460 nm in a 1.0 cm cuvette. Absorbance vs. Concentration 0.45 0.4- y = 4.07x - 0.0046 R = 0.99353 0.35- %3D 0.3- 0.25 0.2- 0.15 - 0.1- 0.05 0.000 0.020 0.040 0.060 0.080 0.100 0.120 Concentration (mM) Absorbance at 460 nm

You want to determine the amount of iron(III) in acomplex salt. You make a 100.0 mL solution of the complex salt by dissolving 0.0670 g of complex salt with water to the mark on a 100.0 mL volumetric flask. You get an absorbance reading for the iron from the spectrometer of 0.334. The molar absorptivity is determined to be 17605 L/mole∙cm and the pathlength is 1.00 cm. Determine the molarity of iron(III) in solution. Determine the mass percentage of iron(III) in the complex salt.

A compound with a molecular weight of 229.61 g/mol was dissolved in 50.0 mL of water. 1.00 mL of this solution was placed in a 10.0 mL flask and diluted to the mark. The absorbance of this diluted solution at 510 nm was 0.472 in a 1.000 cm cuvet. The molar absorptivity of the compound, at 510 nm, is 6,310 M-1 cm-1. Calculate the concentration of the compound in the initial 50.0 mL solution. A. 1.50 x 10-5 M B. 7.48 x 10-5 M C. 7.48 x 10-4 M D. 7.48 x 10-6 M

The absorbance of 10 mL of 0.0005 M Co2+ solution is 0.35. 10 mL of this solution mixed with 10 mL of the sample solution produces an absorption of 0.52. Calculate the concentration of Co2+ in the sample

Absorbance measurements were taken on a series of Fe standards complexed with 1,10-phenanthroline. A plot of absorbance vs. concentration yielded a linear curve with the equation y=1.008e03x + 0.0395 (where y is the absorbance and x represents the Fe concentration in moles/L). Using this information calculate the Fe concentration (in ppm) in a 40.0-mL aliquot of ground water that produced an absorbance of 0.580.

You did not allow enough time for the solution to reach equilibrium before measuring its absorbance. Explain how this will affect the reported value of Kc.