Iron (III) forms a complex with thiocyanate ion that has the formula Fe(SCN)2+. The complex has an absorption maximum at 580 nm. A specimen of well water was assayed according to the scheme below. Calculate the concentration of iron in parts per million.

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Oxidizing Reagent 5.00 5.00 Volumes, mL Fe(II) 2.75 ppm 5.00 0.00 Absorbance, 580 nm (1.00-cm cells) 0.549 0.231 Sample KSCN 0.050 M 20.00 20.00 Sample Volume 50.00 50.00 H2O 20.00 25.00