Oxidations with alkaline permanganate using monovalent thallium for the back titration: Estimation of lead. selenium,tellurium and chromium |
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Authors: | IM Issa RM Issa |
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Institution: | Chemistry Department, Faculty of Science, Cairo University Egypt |
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Abstract: | Monovalent-thallium can be successfully used for the back titration of KMnO4 in the course of estimating Pb+2, Sc+4, Te+4 and Cr+3.Reduction of KMnO4 with Tl+ in alkaline solution yields MnO4-2 which then passes to MnO2. he end-points are attained late, but in presence of telluric acid the end-point at MnO2 stage corresonds to the theoretical value. Reduction at the MnO4-2 stage can be checked in presence of Ba+2 ns and good results obtained with 1–1.5N NaOH. |
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