Contribution of the concept of simple solutions to calculation of the stoichiometric activity coefficients and density of ternary mixtures of hydroxylammonium or hydrazinium nitrate with nitric acid and water

A.-C. Kappenstein; Ph. Moisy; G. Cote; P. Blanc

doi:10.1039/B001351J

Contribution of the concept of simple solutions to calculation of the stoichiometric activity coefficients and density of ternary mixtures of hydroxylammonium or hydrazinium nitrate with nitric acid and water

A.-C. Kappenstein,^a Ph. Moisy,*^a G. Cote^b and P. Blanc^a

* Corresponding authors

^a Commissariat à l'Énergie Atomique (CEA), Valrhô, DCC/DRRV/SEMP/LCAA BP 171, Bagnols-sur-Cèze Cedex, France
E-mail: philippe.moisy@cea.fr

^b ENSCP, Laboratoire d'Electrochimie et Chimie Analytique (UMR CNRS-ENSCP 7575), 11 rue P. et M. Curie, Paris Cedex 05, France

Abstract

Binary data (water activity as a function of the molal concentration) at 25°C for the principal anti-nitrous compounds used in nitric acid aqueous media—hydrazinium nitrate (HDZN) and hydroxylammonium nitrate (HAN)—are determined by direct water activity measurements. Density variations at 25°C are also established. Ternary systems involving these nitrate salts and nitric acid are studied from the standpoint of simple solution theory. It is observed that the system HDZN–HNO₃–H₂O does not exhibit simple behaviour, which is due to the acid–base equilibrium involving HDZN and HNO₃ (i.e., N₂H₆²⁺ formation). On the other hand, the system HAN–HNO₃–H₂O which does not undergo major chemical interactions follows satisfactorily the simple solution rule as long as the water activity is higher than 0.84. For ternary simple solutions it is possible to predict activity coefficients for each component by applying the Zdanovskii–Stokes–Robinson rule and the Mikulin relationship.

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DOI: https://doi.org/10.1039/B001351J
Article type: Paper
Submitted: 18 Feb 2000
Accepted: 07 Apr 2000
First published: 02 Jun 2000

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Phys. Chem. Chem. Phys., 2000,2, 2725-2730

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Contribution of the concept of simple solutions to calculation of the stoichiometric activity coefficients and density of ternary mixtures of hydroxylammonium or hydrazinium nitrate with nitric acid and water

A.-C. Kappenstein, Ph. Moisy, G. Cote and P. Blanc, Phys. Chem. Chem. Phys., 2000, 2, 2725 DOI: 10.1039/B001351J

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Physical Chemistry Chemical Physics

Contribution of the concept of simple solutions to calculation of the stoichiometric activity coefficients and density of ternary mixtures of hydroxylammonium or hydrazinium nitrate with nitric acid and water

Abstract

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Contribution of the concept of simple solutions to calculation of the stoichiometric activity coefficients and density of ternary mixtures of hydroxylammonium or hydrazinium nitrate with nitric acid and water

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