A 100.0-mL sample of spring water was treated to convert any iron present to Fe2+. Addition of 25.00-mL of 0.002517 M K2Cr2O7 resulted in the reaction
6Fe2+ + Cr2O72- + 14H+ →
6Fe3+ + 2Cr3+ + 7H2O
The excess K2Cr2O7 was back-titrated with 8.53 mL of 0.00949 M Fe2+ solution. Calculate the concentration of iron in the sample in parts per million.
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