Potassium permanganate, a strong oxidizing agent, is commonly used in titrations

Question

Potassium permanganate, a strong oxidizing agent, is commonly used in titrations because of its significant purple hue in solution. An experiment was performed in which a sample of iron(II) chloride (FeCl2) was dissolved in water and titrated with potassium permanganate (KMnO4) according to the following balanced equation.

KMnO4(aq) + 8 HCl(aq) + 5 FeCl2(aq) MnCl2(aq) + 5 FeCl3(aq) + 4 H2O(l) + KCl(aq)

If 29.49 mL of 0.1157 M KMnO4 was added to the solution to reach the end point, what mass of FeCl2 was in the sample?

Explanation / Answer

mol of KMnO4 = M*V = 29.49*0.1157 = 3.411993 mmol of KMnO4

ratio is

1:5

then

expect 5*3.411993 = 17.059965 mmol of FeCl2

mass = mol*MW = (17.059965*10^-3 )(126.751) = 2.1623676 g of FeCl2

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