A 290.0-mL sample of spring water was treated to convert any iron present to Fet. Addition of 24.00-mL of 0.002577 M K2Cr2O7 resulted in the reaction 6FE2+ + Cr2O7? +14H+6Fe+ +2Cr+ +7H2O The excess K2 Cr207 was back-titrated with 8.58 mL of 0.00933 M Fe+ solution. Calculate the concentration of iron in the sample in parts per million. Concentration of inon = ppm

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