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![[Post New]](/templates/default/images/icon_minipost_new.gif) 31 Jan 2008 11:24:37 IST
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a 8.0 gm sample contained Fe3O4, Fe2O3 and inert materials ...it was treated with excess of aqueous KI in acidic medium , which reduced all the ions to Fe+2 ions ....the resulting solution was diluted with 50 cm3 and 10 cm3 of itwas taken ...the liberated iodine in thi solution required 7.2 cm3 of 1.0 M Na2S2O3 for reduction to iodide .the iodine from another 25cm3 sample was extracted .after which Fe+2 ions was titrated against 1.0 M KMnO4 in acidic medium .. the volume of KMnO4 soln was found to be 4.2 cm3 . calculate the mass percentages of Fe3O4 and Fe2O3 in the orginal mixture
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