Bathophenanthroline is a compound that forms a red complex with iron(II). The molar absorptivity for the complex is 22350 L mol-1 cm-1 at wavelength 535nm.

a.) Determine the molar concentration range of the iron(II)-bathophenanthroline complex that can be analyzed directly with a spectrophotometer, using a 1cm 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).