3.00 gram sample containing fe3o4, fe2o3 and an inert impure substance is treated with excess of kI solution in presence of dilute h2so4.the entire iron is converted into fe2+ along with the liberation of iodine. The resulting solution requires 11 ml of 0.5 molar na2s2o3 solution to reduce the iodine present.A 50 ml of the dilute solution after complete extraction of the iodine required 12.80ml of 0.25 molar k m n o 4 solution in dilute h2so4 medium for the oxidation of fe2 +. Calculate the percentage of fe2o3 & fe3o4 in the original sample

ashu , 11 Years ago

Grade 11