Bathophenanthroline is a compound that forms a red complex with iron(II). The molar absorptivity for the complex is 22,350 L mol^-1 cm^-1 at wavelength 535 nm.
a)Determine the molar concentration range of the iron(II)-bathophenanthroline complex that can be analyzed directly with a spectrophotometer, using a 1-cm cuvette.
b)Convert the molar concentrations calculated above to grams of iron(II) per liter of solution. Comment on the sensitivity of the method in determining the concentration of iron(II).