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  • 1 Universita di Messina Salita Sperone Dipartimento di Chimica Industriale e Ingegneria dei Materiali 31 (Casella Postale 29) 98166 Sant'Agata di Messina Italy 31 (Casella Postale 29) 98166 Sant'Agata di Messina Italy
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A small ultraviolet-visible absorption spectrometer which uses fibre optic coupled immersion probes has been incorporated into a laboratory scale reaction calorimeter. The combined instrument has been tried out using the hydrolysis of acetic anhydride as a test reaction. With the calorimeter operating in the isoperibolic mode good agreement is found for the pseudo-first order reaction rate constant as determined from spectroscopic and calorimetric measurements. Experiments have been made in order to follow the reaction indirectly using optical pH measurements with acid-base indicators. The possibility of determining the temperature dependence of the rate constant in a single experiment has also been investigated.