A researcher tries to find out the mass percent composition of an Iron ore sample.

The researcher weighted 1.30 g of Iron ore and dissolved it in HCl (aq) solution. Based on

the given redox reaction generated Fe2+ is titrated with 32.5 mL of 0.088 M of potassium

permanganate. Find the mass percent Fe in the ore sample? What if the researcher dilutes

the potassium permanganate solution to half and uses the same volume of solution for

titration, how many grams of iron remains unreacted?

Fe2+ + MnO4- → Fe3+ + Mn2+ (not balanced)

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