Oxidations with alkaline permanganate using monovalent thallium for the back-titration: Determination of iodate,iodide and ferrocyanide |
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Authors: | I.M. Issa A.A. Abdul Azim |
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Affiliation: | Chemistry Department, Faculty of Science, Cairo University Egypt |
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Abstract: | Iodate, iodide, iodine and ferrocyanide can be estimated by oxidation with KmnO4 in alkaline media; the excess is back-titrated with TI7. I- and I2 are oxidized to IO4- in the presence of Ba+2 ions but only to IO3- in absence of such ions. The direct titration of IO3-, I- with KmnO4 proved valueless.Ferrocyanide is oxidized by KmnO4 in alkaline solutions and MnO2 is formed. In the presence of telluric acid and 0.025–0.1 N NaOH satisfactory results are obtained. Reduction of MnO4- with ferrocyanide gives MnO4-2 and the results are variable, depending on the rate of adding the ferrocyanide. |
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