IODOMETRIC DETERMINATION OF SOME INORGANIC OXIDANTS IN BINARY MIXTUREBY SELECTIVE DECOMPOSITIONS OF ONE OF THE COMPONENTS

The individual components of binary mixtures composed of MnO4-, BrO3-, Cr2O7(2-), and IO3- have been determined iodometrically employing app osite organic substrates to decompose selectively and quantitatively o ne of the oxidants. In the aqueous solution the MnO4- reacted with cin namic acid to furnish an insoluble derivative which was separated by f iltration from the other oxidant followed by estimation of each ingred ient. When BrO3- was present with Cr2O7(2-), the former was decomposed completely with KBr in the presence of dilute acid and acetanilide at room temperature. Iodometric estimation of IO3- in the presence of ei ther BrO3- or Cr2O7(2-) was carried out using potassium hydrogen phtha late or formalin to decompose BrO3- or Cr2O7(2-). The total amount of oxidant was determined iodometrically in every mixture to calculate th e quantities of each component.