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25.0mL sample with HNO3 and treated it with excess KSCN to from a red complex. (KSCN itself is…

When I was a boy, I watched Uncle Wilbur measure the iron content of runoff from his banana rach. He acidified a 25.0mL sample with HNO3 and treated it with excessKSCN to from a red complex. (KSCN itself is colorless.) He then diluted the solution to 100.0 mL and put it in a variable-pathlength cell. For comparison, hetreated a 10.0 mL reference sample of 6.80*10^-4 M Fe+3 with HNO3 and KSCN and diluted it to 50.0 mL. The reference was placed in a cell with a 1.00 cm pathlength.Runoff had the same absorbance as the reference when the pathlength of the runoff cell was 2.48 cm. What was the concentration of iron in Uncle Wilbur's runoff?

Please show all work. I have the answer, I just don't understand how to do it.

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