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April 24, 2014

Homework Help: chemistry

Posted by darren on Wednesday, February 15, 2012 at 5:17pm.

The amount of Fe in a 2.0008 g sample of an iron ore was determined by a redox titration with K2Cr2O7. The sample was dissolved in HCl and the iron brought to a +2 oxidation state. Titration required 26.48 mL of 0.034 M K2Cr2O7. Calculate the iron content as %w/w Fe2O3.

Cr2O72- + 14H+ + 6Fe2+ → 2Cr3+ + 7H2O + 6Fe3+

hint: Remember you are looking for Fe2O3 (2 mols of Fe)

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