Investigation of Oxidation-Reduction and Acid-Base Reactions of Oxalate with Some Oxidizing Agents

摘要

Different types of chemical reactions were carried out at 160C under vacuum in molten nitrate eutectic medium. The gases evolved during the reaction studies were analyzed qualitatively. All the product compounds were characterized by using UV-visible and Atomic absorption spectrophotometry, XRD analysis and TGA. The oxalate contents of the metal oxalates were determined titrimetrically and potentiometrically. During the acid-base reactions, two stong acids i.e. dichromate and pyrosulphate were converted into chromate and sulfate respectively. In redox reaction studies, Cerium (IV), Chromium (VI) and Iron (III) were reduced. Manganese (VII) was reduced to Manganese (VI) followed by the formation of mixed oxides. In complexation reactions of Potassium dichromate as well as of Potassium chromate, chromium was reduced. In reactions of carbonates of metals, Nichel (II), Manganese (II), with excess of oxalic acid, simple oxalates were formed.