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MnO₄⁻ + 8 H⁺ + 5e ---> Mn²⁺ + 4 H₂O
Fe²⁺ - 1e ---> Fe³⁺ /*5
MnO₄⁻ + 8 H⁺ + 5 Fe²⁺ ---> Mn²⁺ + 4 H₂O + 5 Fe³⁺
42,8 cm³ = 0,0428 dm³
1 mol MnO₄⁻ --- 5 moli Fe²⁺
0,01284 mola MnO₄⁻ --- x
x = 0,0642 mola = 64,2 milimola Fe²⁺