Thursday
October 2, 2014

Homework Help: Chemistry

Posted by Sam on Monday, July 12, 2010 at 6:10am.

In a previous
experiment, 0.800 g of the green complex iron salt was placed in an Erlenmeyer flask and
heated with concentrated sulfuric acid until all oxalate ion was destroyed (CO2, SO2 and
H2O are formed). Ferric ion (Fe3+) remained in solution and was reduced to Fe2+ by reaction
with Al wire. The ferrous ion (Fe2+) was then titrated with KMnO4 solution according to
equation (2) and 32.60 mL of 0.0100 M permanganate solution was required to reach the
endpoint. The blank required 0.03 mL of the permanganate solution. Find the mass % of
iron in the complex salt.

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