A simple method for modelling and prediction of the specific heat and density of aqueous electrolyte solutions

A requirement for numerous applications of electrolyte solutions is the knowledge of the properties for as many as possible substances in a maximum range of concentration, although often with limited accuracy. Semiempirical methods, created through the knowledge of similarities in an analogue group of electrolytes offer an easy way to predict certain data for concentration ranges and electrolyte solutions not covered by measurements of these properties. It could be shown that specific heat and density of aqueous electrolyte solutions can be described by means of a single parameter method, based on the scaling of the molality axis, thus generating a general reference function. Knowing this function and the affiliated scale factor, which gives the so called “effectiveness coefficient”, values of the respective property are available over the whole range of concentration. Also, a method is described to estimate the effectiveness coefficient for uninvestigated electrolytes.