To measure the iron content of runoff from a ranch a 25.0 mL sample of run off was acidified with HNO3 and treated with excess KSCN to form a red complex.  (KSCN itself is colorless.)  The solution was then diluted to 100 mL and put into a variable pathlenght cell.  For comparison, a 10.0 mL reference sample of 6.80 x 10-4 M Fe3+ was treated with HNO3 and KSCN and diluted to 50.0 mL.  The reference was placed in a cell with a 1.00 cm pathlenght.  The runoff had the same absorbance as the reference when the pathlenght of the runoff cell was 2.48 cm.  What wa the concentraton of iron in the runoff?

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Chapter21: Transition Metals And Coordination Chemistry
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To measure the iron content of runoff from a ranch a 25.0 mL sample of run off was acidified with HNO3 and treated with excess KSCN to form a red complex.  (KSCN itself is colorless.)  The solution was then diluted to 100 mL and put into a variable pathlenght cell.  For comparison, a 10.0 mL reference sample of 6.80 x 10-4 M Fe3+ was treated with HNO3 and KSCN and diluted to 50.0 mL.  The reference was placed in a cell with a 1.00 cm pathlenght.  The runoff had the same absorbance as the reference when the pathlenght of the runoff cell was 2.48 cm.  What wa the concentraton of iron in the runoff?   

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