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July 31, 2014

Homework Help: chemistry

Posted by mohd on Sunday, April 4, 2010 at 5:06am.

A 1.362 g sample of an iron ore that contained Fe_3O_4 was dissolved in acid and all the iron was reduced to Fe^2+. the solution was then acidified with H_2SO_4 and titrated with 39.42 mL of 0.0281 M KMnO_4 , which oxidized the iron to Fe^3+.
Net ionic equation
5Fe^(2+)+MnO_4^-+8H^+→5Fe^(3+)+Mn^(2+)+4H_2O

a) what was the percentage by mass of iron in the ore?
b) what was the percentage by mass of Fe_3O_5 in the ore

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