SrNGH el al.1 used ferrous ethylenediamine
sulphate for the indirect volumetric determinations of potassium chlorate, potassium bromate, potassium metaperiodate, potassium dichromate, potassium ferricyanide, potassium permanganate, potassium persulphate, hydrogen peroxide and ceric sulphate. The excess of ferrous ethylcnediamine sulphate added to each of the substances was titrated with standard potassium perxnanganate, standard potassium dichromate and standard ceric sulphate solution.
SINGH et al.2 also used ferrous ethylenediamine sulphate to estimate indirectly potassium permanganate, ceric sulphate, potassium chlorate, hydrogen peroxide, potassium persulphate, potassium dichromate, and potassium bromatc by a potentiometric method using standard potassium permanganate as the titrant. In the present investigation these substances have been determined indirectly using ferrous ethylenediamine sulphate solution as reducing ilgent. The excess of standard ferrous ethylenediamine sulphate solution added to each of the substances in acid medium was titrated potcntiometrically with standard ceric sulphate solution. STUDIES IN OXIDATION-REDUCTION REACTIONS. SSI 569
TABLE I TlTRATIOS OF 0.0221 g OF POTASSlUBl PERMAXGANATE WXED WITH 25 nil OF WATEK, o-S.00 ml OF 0.0gA FERROUS ETHYLENEDIA~lISE SULPHATG ASD 30 ml OF .$N H&SO, AGAINST