Thermodynamic characteristics of the system NaNO2-NaNO3

Abstract

The activities and activity coefficients of the components of the system NaNO 2 3NaNO 3 , obtained from experimental saturated vapor pressures measured at 798, 823, and 848 K, were used to calculate the total and excess partial molar Gibbs energies DG iand total relative and excess thermodynamic properties DG, DG ex , DS, DS ex of the system.Formation of a melt from pure components is accompanied by a change in the thermodynamic functions that characterize the given system. Of particular interest are changes in the Gibbs energy (DG), enthalpy (DH ), and entropy of mixing (DS ). If these quantities are known, the structure of the system and forces of ion3ion interaction between the components can be characterized.The activities a i and activity coefficients g i of the components of the system, determined by measuring the saturated vapor pressures [133], were used to calculate the total partial molar and excess partial molar Gibbs energies [4] for sodium nitrite and nitrate.DG i ! = 2.3RT log a i , DG i ex !! = 2.3RT log g i .

Correlation of content and corrosion protection of volatile corrosion inhibitors in packaging material – regaining trust in VCI

“…A correlation of the VCI amount and the observed corrosion protection is plausible for the paper with a highly volatile component of a primary amine. However, it is not trivial to consider sodium nitrite the same way because of its low volatility 29.…”