Ideality and ionization in hydrothermal fluids; the system MgO-H 2 O-NaOH

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ID: 294195
1963
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Abstract
Phase relations were determined for the low NaOH portion of the ternary system MgO-H ~2~ O-NaOH. The univariant curve representing equilibrium among brucite, periclase, and pure water passes through the points 547 degrees C., 250 bars; 572 degrees C., 500 bars; 6O7 degrees C., 1000 bars; 634 degrees C., 1500 bars; and 657 degrees C., 2000 bars. The P-T curve representing univariant equilibrium among brucite, periclase, and 12.5 molal NaOH solutions occurs 65 degrees C. below the curve for stable coexistence of brucite, periclase, and pure H ~2~ O at 2000 bars fluid pressure, and is 50 degrees C. lower at 1000 bars P ~F~ . Similar but smaller displacements are noted for 5.0 molal NaOH solutions. The fugacity of water in the NaOH solutions has been calculated using 1) entropy data derived from study of the system MgO-H ~2~ O, 2) estimated heat capacity of H ~2~ O in the solutions, and 3) the P-T conditions for each NaOH solution coexisting with brucite and periclase. Degree of ideality of mixing in these solutions increases rapidly with rising temperature, particularly in the more concentrated solution; this effect correlates with the decreasing ionization of NaOH with rising temperature and consequent diminution of interaction between solvent and solute. From compilation of ionization constants for other bases, acids and salts, it is suggested that 1) NaOH may be a common molecular species in hydrothermal solutions above roughly 400 degrees C., 2) hydrothermal solutions are generally alkaline, and 3) the ideality of mixing of other natural nonvolatile solutes may closely approach the degree of ideality observed for NaOH in our experimental region above 500 degrees C.
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Authors H. L. Barnes, E. Ernst
Journal american journal of science
Year 1963
DOI
10.2475/ajs.261.2.129
URL
https://ajs.scholasticahq.com/article/58971.pdf
Keywords Keywords not found

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