Calculated diagrams, representing chemical and electrochemical properties of concentrated aqueous nitric acid mixtures, have been drawn for temperatures of 25 °C and 100 °C using vapor pressures and thermochemical data of related gaseous species. Electrochemical measurements have permitted the establishment of an experimental potential scale (referenced to the saturated mercurous sulfate electrode at 25 °C) incorporated in the diagram at 100 °C. These measurements also allowed the determination of the Gibbs free energy of formation of dissolved nitrous acid for various nitric acid solutions at 100 °C, leading to a value of ΔGf(HNO2) = –36.31 kJ mol−1, for the whole nitric acid concentration range.
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Balbaud et al. (1999) studied this question.
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