2) The ferrous ion-orthophenanthroline complex can be used toanalyze for Fe(II) by using the absorption of this complex at 508nm. A group of samples is known to contain between 0.1 and 0.2 g ofFe. A known sample containing 100 mg of Fe per liter was treatedaccording to protocol, and the absorbance on a filter photometerwas set to 0. The absorbance of a second standard containing 200 mgFe per liter was then determined to be 0.795. What is theconcentration of the unknown, which was then found to have anabsorbance of 0.650?
