Publication Date


Document Type


First Advisor

Joncich, M. J.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Chemistry


Electrochemical analysis; Electrochemistry; Heat


While it is true that electrochemical calorimetry is limited in its applicability to reactions which can be carried out quantitatively by electrical means, this method does offer a direct one-step measurement and thus avoids the multi-step determinations which are required by conventional calorimetry. Electrochemical calorimetry, used in areas in which it is applicable, has proven its potentiality and usefulness in research. It was necessary that extensive instrumentation be used in this research since both calorimetric and electrochemical measurements are involved. Thus, the calorimeter was equipped with a thermistor for the temperature measuring element. The thermistor, which changes approximately four percent per degree in resistance, was made one arm of a Wheatstone bridge. It was possible to measure temperature changes as small as 10-5 °C, corresponding to 4 x 10-3 calories of heat liberated by the electrochemical reaction, using the temperature measuring system developed in this research. The enthalpy change of the reaction Ag(s) + HC1(aq) = AgCl(s) + 1/2H2(g) was measured directly for several concentrations of hydrochloric acid by means of the electrochemical calorimetry technique; the heat of formation of AgC1(s) was calculated and compared with the accepted values.


Includes bibliographical references (pages 57-58)


viii, 58 pages




Northern Illinois University

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