Thermodynamic Modeling of Apparent Molal Volumes of Bivalent Metal Nitrate Salts with Pitzer Model

Mouad Arrad

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Thermodynamic Modeling of Apparent Molal Volumes of Bivalent Metal Nitrate Salts with Pitzer Model

Mouad Arrad

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Submitted: 22 Apr 2025 | Revised: 3 Jun 2025 | Accepted: 5 Jun 2025 | Published: 12 Jun 2025

Abstract

The apparent molal volumes of selected bivalent metal nitrate salts, Co(NO₃)₂, Ni(NO₃)₂, and Mg(NO₃)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 have been fitted to the Pitzer model using its volumetric contributions. The model parameters , , and were determined for each aqueous electrolyte, over the composition range from 0 to about 4.5 mol·kg⁻¹·H₂O. The new experimental data and parameters obtained will be useful to extend the present database of electrolyte solutions and provide a reliable model for industrial use, which could be extended to other thermodynamic properties.

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Arrad, M. (2025). Thermodynamic Modeling of Apparent Molal Volumes of Bivalent Metal Nitrate Salts with Pitzer Model. Advanced Chemical Process Analysis, 1(1), 4. https://www.sciltp.com/journals/acpa/articles/2506000737

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