Oscillatory reaction of bromate-gallic acid. A calorimetric and electrometric study in aquo-organic solvent media

The oscillatory reaction between potassium bromate and gallic acid (in pres ence of sulfuric acid and ferroin indicator) has been calorimetrically and potentiometrically studied in binary mixtures of water and organic solvents viz. dimethyl formamide, acetonitrile, tetrahydrofuran and 1,4-dioxan. The effects of solvent polarity, stirring condition, indicator concentration, aerial oxygen and chloride ion on the oscillatory process have been examine d. The oscillatory behaviour of the reaction probed by the potentiometric m ethod has a general agreement with the calorimetric method. An attempt has been made to determine the order of the Fe2+-->Fe3+ oxidation reaction. The damping coefficients of the oscillatory process in aqueous and mixed solve nt media have been estimated.