Isothermal Binary Liquid-Vapour Equilibria and the EGC-Method

Oonk, H. A. J.; Sprenkels, A.

doi:10.1524/zpch.1971.75.5_6.225

Cited by 4 publications

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Solid‐Solute Phase Equilibria in Aqueous Solution. I. Solubility Constant and Free Enthalpy of Formation of Huntite

Königsberger

Gamsjäger

1987

Ber Bunsenges Phys Chem

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Solid binary carbonate phases often dissolve congruently in aqueous media, even when they are not stable under the prevailing conditions. From the thermodynamic point of view these dissolution reactions lead to a metastable equilibrium with fixed composition, when neither diffusion in the solid state nor recrystallization from the solution occurs. The solubility of natural huntite. CaMg3(CO3)4, was studied potentiometrically at 50°C and I = 3.0 mol kg−1 (Na)ClO4. Since it dissolved congruently the solubility constant log *Kpso = log{[Ca2+]0.25 [Mg2+]0.75 p CO 2[H+]−2} = 10.36 ± 0.03 was used to calculate its standard free enthalpy ΔfG0298 (Ca0.25Mg0.75CO3) = −1045.0 ± 2.4 kJ mol−1; thus huntite is considerably less stable than the corresponding mechanic mixtures of calcite or dolomite and magnesite respectively. Stable and metastable equilibria in carbonate systems can be graphically presented by phase diagrams with In *Kpso and mole fractions as variables, where *Kpso is the total solubility constant defined by *Kpso = ([Ca2+] + [Mg2+]) p CO 2 [H+]−2.

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Solid‐Solute Phase Equilibria in Aqueous Solution. I. Solubility Constant and Free Enthalpy of Formation of Huntite

Königsberger

Gamsjäger

1987

Ber Bunsenges Phys Chem

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A thermodynamic method for the derivation of the solidus and liquidus curves from a set of experimental liquidus points

et al. 1980

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A thermodynamic method is presented which makes possible the correct derivation of solidus and liquidus curves from a set of experimental liquidus points. In an iterative procedure, which is based on the equal-G curve and which uses intermediate phase diagram calculations, the liquidus of the calculated phase diagram is made to run through the experimental liquidus points. In addition, information about the thermodynamic mixing properties of the system is obtained_ Results are given for the systems p-dichlorobenzene + p-dibromobenzene, KzCOs + KzS04, KCI + NaCI.

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1981

Studies in Modern Thermodynamics

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Isothermal Binary Liquid-Vapour Equilibria and the EGC-Method

Cited by 4 publications

References 0 publications

Solid‐Solute Phase Equilibria in Aqueous Solution. I. Solubility Constant and Free Enthalpy of Formation of Huntite

Solid‐Solute Phase Equilibria in Aqueous Solution. I. Solubility Constant and Free Enthalpy of Formation of Huntite

A thermodynamic method for the derivation of the solidus and liquidus curves from a set of experimental liquidus points

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