A 6.00 g sample contained Fe_(3)O_(4), Fe_(2)O_(3) , and inert materials. It was treated with an excess of aqueous Kl in acidic medium which reduced all the iron to Fe^(2+). The resulting solution was diluted to50 ml . and a 10 mlsample of it was taken . The liberated iodine reacts with 5.5 ml. of 1 M Na_(2)S_(2)O_(3)solution, yielding S_(4)O_(6)^(2-) . The iodine from another 25 ml . sample was extracted , after which the Fe^(2+) was titrated with 3.2ml of 1 M MnO_(4) " in " MnO_(4)^(-) solution . Calculate the percentage of Fe_(3)O_(4)" and " Fe_(2)O_(3) in the original mixture.

A 6.00 g sample contained Fe_(3)O_(4), Fe_(2)O_(3) , and inert materia

1.	A 6.00 g sample contained Fe_(3)O_(4), Fe_(2)O_(3) , and inert materials. It was treated with an excess of aqueous Kl in acidic medium which reduced all the iron to Fe^(2+). The resulting solution was diluted to50 ml . and a 10 mlsample of it was taken . The liberated iodine reacts with 5.5 ml. of 1 M Na_(2)S_(2)O_(3)solution, yielding S_(4)O_(6)^(2-) . The iodine from another 25 ml . sample was extracted , after which the Fe^(2+) was titrated with 3.2ml of 1 M MnO_(4) " in " MnO_(4)^(-) solution . Calculate the percentage of Fe_(3)O_(4)" and " Fe_(2)O_(3) in the original mixture.
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