Determine an unknown volume or concentration using an oxidation–reduction titrat

Question

Determine an unknown volume or concentration using an oxidation–reduction titration. Close Problem The concentration of a Fe2+ solution is determined by titrating it with a 0.1659 M solution of permanganate. The balanced net ionic equation for the reaction is shown below. MnO4-(aq) + 5 Fe2+(aq)+8 H3O+(aq) Mn2+(aq) + 5 Fe3+(aq)+12 H2O(l) In one experiment, 16.14 mL of the 0.1659 M MnO4- solution is required to react completely with 30.00 mL of the Fe2+ solution. Calculate the concentration of the Fe2+ solution.

Explanation / Answer

To perform this calculation it is necessary to use a reaction ratio, taking into account the reaction reactors of each reagent:

C1 * V1 = C2 * V2

where:

1: MnO4-

2: Fe2 +

C2 = C1 * V1 / V2 * (5 moles Fe2 + / 1 mol MnO4-) = 0.1659 M * 16.14 mL / 30 mL * (5 moles Fe2 + / 1 mol MnO4-) = 0.4463M.

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