Permanganate Titration

Permanganate Titration

 

a method in titrimetric chemical analysis that uses solutions of potassium permanganate (KMnO4) for quantitative volumetric determinations. One advantage of permanganate titration is that a special indicator is not needed to establish the equivalence point, since KMnO4 solution itself exhibits a characteristic violet-red color. In most cases, the titration of reducing agents [for example, Fe(II) and Mn(II), Mo(III) and Ti(III), Permanganate Titration, and H2O2] with a standard KMnO4 solution is carried out in an acid medium, and the oxidation-reduction reaction proceeds according to the equation

Certain substances, for example, sulfites, sulfides, thiosulfates, and hydrazine, are oxidized more readily in neutral or alkaline mediums, in which case the reaction follows the pattern Permanganate Titration The concentration of the metals Ca, Mg, Zn, La, and Th is determined by combining permanganate titration and precipitation of the metal ions as oxalates.

REFERENCES

See references under OXIDIMETRY.
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For permanganate titration of iron, a small volume of dissolved sample was mixed with an equal volume of 1M sulfuric acid and titrated with 0.01M potassium permanganate until a purple colouration was observed, indicating the presence of excess permanganate and the exhaustion of iron in the sample.
The comparison of the permanganate titration with MnS04 addition appeared meaningful, because Kolthoff et al.
Huckaba CE, Keyes FG (1948) The accuracy of estimation of hydrogen peroxide by potassium permanganate titration. Journal of the American Chemical Society 70, 1640-1644.