With suitable chemical equations show how potassium permanganate can b

Question

With suitable chemical equations show how potassium permanganate can be used for the analysis of iron(II) and As(III). What is the advantage of using potassium dichromate over permanganate in estimating iron(II)?

26 Apr 2023

Answer :

Word Count : 527

Potassium permanganate (KMnO4) and potassium dichromate (K2Cr2O7) are both powerful oxidizing agents commonly used in analytical chemistry. Let's discuss how potassium permanganate can be used for the analysis of iron(II) and As(III) and the advantage of using potassium dichromate over permanganate in estimating iron(II).

Analysis of Iron(II) using Potassium Permanganate:
Potassium permanganate can be used to determine the concentration of iron(II) ions (Fe2+) in a solution through a redox reaction. In this reaction, the purple-colored permanganate ions (MnO4-) are reduced to colorless manganese ions (Mn2+), while iron(II) ions are oxidized to iron(III) ions (Fe3+). The balanced chemical equation is as follows:
5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O

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