Oxidations with alkaline permanganate using monovalent thallium for the back titration: Estimation of hydrazine |
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Authors: | IM Issa RM Issa |
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Institution: | Chemistry Department, Faculty of Science, Cairo University, GizaEgypt |
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Abstract: | Oxidation of liydrazine in alkaline solutions with KmnO4, gives inaccurate results both in the presence of absence of telluric acid. The titration curve is characterized by two inflections.Titration of KmnO4 with hydrazine gives good results in the presence of Ba+2 ions and 0.75–1NNaOH (when MnO4- gives MnO2-) or in the presence of 0.5–2.5N NaOH only (when MnO4 gives MnO2).Hydrazine could be estimated by oxidation with KMn04 either in the presence of Ba+2 ions or telluric acid, after which the excess permanganate is back titrated with monovalent thallium. The alkalinity is Kept at 1N NaOH. |
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