3. A 100.0 mL sample of ground water was treated to convert the iron present to Fe2+. Addition of 25.00 mL of 0.002412 M K2Cr2O7 resulted in the reaction below. 6Fe2+ + Cr2O72 - + 14H+ → 6Fe3+ + 2Cr3+ + 7H2O The excess K2Cr2O7 was back-titrated with 8.12 mL of 0.00859 M Fe2+ solution. What is the concentration of Fe in the sample in parts per million?

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A:

Q: A 110.0-mL sample of spring water was treated to convert any iron present to Fe2+. Addition of…

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Q: A 100.0-mL sample of spring water was treated to convert any iron present to Fe. Addition of…

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