The heats of dilution of KCI, MgCI2, Na2S04, and MgS04 were measured over a concentration range of 0.005-2.Om at temperatures between 40-80°C. The data were extrapolated to infinite dilution by use of the Debye-Hückel limiting law to obtain relative apparent molal heat contents ( _). The heats of dilution of MgCI2 and MgS04 were measured at 25 °C and combined with the low concentration work of Lange and Streeck to yield values of L. The relative partial molal heat content of solvent and solute was calculated from the experimental values. The heat content data were then used to calculate activity and osmotic coefficients in the temperature range 40-80°C.

Die Verdünnungswärmen von KCl, MgCl2, Na2SO4 und MgSO4 werden über den Konzentrationsbereich von 0,005 bis 2,0m bei Temperaturen zwischen 40 bis 80°C gemessen.