TEMPERATURE OSCILLATIONS IN BROMATE-GALLIC ACID SYSTEM - A CALORIMETRIC STUDY

The oscillatory reaction between potassium bromate and gallic acid in sulfuric acid medium has been studied calorimetrically with and withou t ferroin indicator. Enthalpy changes during oscillations have increas ed with increasing bromate concentration in presence and absence of th e indicator. Prominent catalytic activity of the indicator has been ob served. An initial large enthalpy change has been observed in both unc atalyzed and catalyzed conditions prior to the starting of oscillation . Attempts have been made to correlate the main thermal events with th e proposed mechanism of the reaction. (C) 1995 John Wiley and Sons, In c.