All of the iron in 1.594 g of an iron sample is converted into the Fe2+, which was then titrated with dichromate:
14H1+ +Cr2O72- + 6Fe2+ ->6Fe3+ + 2Cr3+ + 7H2O
Determine the mass percent iron in the sample if 25.58 mL of 0.10445M K2CrO7 were needed to reach the equivalence point?