Abstract
A calorimerter composed of a Dewar vessel and a Beckmann thermometer was constructed. By means of this calorimeter, the heat capacities of aqueous solutions of ethylene glycol, propyrene glycol, and butanediol were measured at 30d C. It was confirmed by the measurement of heat capacities of n-heptane that the errors due to the evaporation were negligible. The partial molar heat capacities at the infinite dilution were obtained for the respective solutes. The structural changes of water caused by the dissolution of these solutes were discussed,
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