Question: 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

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.

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

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