Iodo-Potentiometric Technique for the Estimation of Potassium Permanganate

Abstract

Potasium permanganate is estimated quantitatively by carrying out iodo-potentiometric method. The uniqueness of the procedure is that both iodometric and potentiometric results are obtained in two-in-one cell. A quantitative relationship is noticed between the potentials, EM and the volumes of standard sodium thiosulphate (V₁ and V₂, mL) consumed in potentiometric and volumetric titrations for all concentrations. The potentials, EM, are found, again, to have a linear relationship with the concentration of KMnO₄ sample taken. The titre volumes of both potentiometric and iodometric methods (V₁ and V₂, mL) are identical. It is quite interesting to note that estimation of _KMnO4 is possible in the light of the above facts. An excellent conformity of results are observed for potentiometric, iodometric and volumetric (using FAS and oxalate methods chemical analysis) titration data for the estimation of the percentage of KMnO₄ sample.