The apparent molal volumes of selected metal nitrate salts, Al(NO 3 ) 3 , Fe(NO 3 ) 3 , and Mn(NO 3 ) 2 , in water have been assessed from the available density measurements of their aqueous solutions at 25 °C over a wide molality range. The values of ϕ V have been fitted to the Pitzer model using its volumetric contributions. The model parameters β (0)V , β (1)V , C φV , and V̅ 0 were determined for each aqueous electrolyte, over the composition range from 0 to about 3.5 mol•kg −1 H 2 O. The new experimental data and parameters obtained will be useful to extend the present database of electrolyte solutions as well as its application areas, allowing management of many physical properties of aqueous solutions in a numerical way in various end-uses.
A calculation method is presented in this work to evaluate the ion interaction parameters for the Pitzer model from freezing points of aqueous solutions of pure electrolytes and solubility. To show the reliability of this method, one system that was not covered by the open literature was chosen. Using a small number of experimental data we were able to determine Pitzer parameters for this system reaching a concentration up to 1.8 mol −1 kg −1 Using this set of parameters thermodynamic properties such as osmotic coefficient, water activity, and mean activity coefficient were estimated at low temperatures for ferric nitrate−water system.
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