Thermodynamics of the ternary system: Water-glycine-potassium chloride at 25 °C from vapor pressure measurements

Abstract

The thermodynamic properties of the ternary system: water-glycine-potassium chloride at 25 °C have been evaluated by means of isopiestic vapor pressure measurements. The effect of added glycine on the activity coefficient of potassium chloride has been calculated and the effect of added potassium chloride on the activity coefficient of glycine. The variation of the activity coefficient of potassium chloride has been studied previously by Roberts and Kirkwood, using an entirely different method-the measurement of the emf of suitable concentration cells. The agreement between these independent measurements is shown to be excellent within the concentration ranges common to both experiments.