Design and testing of a calorimeter for measurements on electrochemical reactions with gas evolution

A heat-conduction calorimeter suitable for the study of electrochemical processes has been constructed. The reaction vessel of 25 cm3 volume was fitted with electrodes, calibration heater, stirrer, thermocouple, and thin Teflon tube for addition of liquid. Gas evolved could leave the vessel through a gas-outlet tube. Good thermal conductivity was achieved by mounting nine thermocouple plates between the vessel and the surrounding heat sink and by letting the heat sink be in good thermal contact with the thermostat bath. The calorimeter was tested by measurements on the electrolysis of water and of heavy water and found to have an accuracy better than 0.2 per cent. (author)