PARTIAL MOLAL HEAT-CAPACITY OF AQUEOUS FERROUS CHLORIDE FROM MEASUREMENTS OF INTEGRAL HEATS OF DILUTION

Heats of dilution of concentrated aqueous solutions (4.43 moles-kg-1) of FeCl2 were measured at 15, 25, and 35°C. The heat capacities of these concentrated solutions were also measured at the same temperatures. From these data the partial molal heat capacity, Cp20(FeCl2, aq, 298.15°K)=-2.56±30 J-°K-1-mole-1, was calculated. The partial molal heat capacity of Fe2+(aq), -2±30 J-°K-1-mole-1, was correlated with the correspondence principle" equations of Criss and Cobble. © 1979 Plenum Publishing Corporation."