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When Dr. Harris was a boy, Uncle Wilbur let me watch as he analyzed the ironcontent of runo± from his banana ranch. A 5.00 mL sample was acidi²ed withnitric acid and treated with excess KSCN to form a red complex. (KSCN iscolorless). The solution was then diluted to 25.00 mL and put in a variablepathlength cell. ³or comparison, a 10.0 mL reference sample of 7.62 x 10-4M³e3+was treated with HNO3and KSCN and diluted to 25.00 mL. This referencesample was placed in a 1.00 cm light path. The runo± sample exhibited thesame absorbance as the reference when the path length of the runo± cellwas 4.08 cm. What was the concentration of iron in ppm ³e (not M) in UncleWilbur's runo±?
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