Conductivity Measurements of Dilute Aqueous HCl Solutions to High Temperatures and Pressures Using a Flow-Through Cell

Abstract

The limiting molar conductance Λ 0 and molal ion association constant K A (m) of dilute (10 -5 to 10 -3 mol‚kg -1 ) aqueous HCl solutions were determined using a flow-through conductance cell at temperatures from 100 to 410°C and densities from 0.96 to 0.27 g‚cm -3 . The flow-through cell is designed to measure molar conductances of dilute aqueous electrolytes with a high degree of accuracy at high temperatures and low densities. The resulting Λ 0 values are in general agreement with those reported by Noyes (1907), Wright et al. (1961), Pearson et al. (1963), and Lukashov et al. (1975 for densities that range from 0.7 to 0.4 g‚cm -3 at comparable conditions. However, when compared to values reported by Frantz and Marshall (1984), the new results are in agreement at densities (F) > 0.5 g‚cm -3 , but from 0.5 to ca. 0.4 g‚cm -3 , their calculated results are 5-11% higher. Below 0.4 g‚cm -3 where the experimental uncertainties are large, the weighted values from the new study are approximately 14-35% lower. Within experimental uncertainties, the new K A (m) values are in good agreement with the reported values from Franck (1956), Wright et al. (1961), Pearson et al. (1963), and Lukashov et al. (1975 at densities from 0.7 to 0.3 g‚cm -3 but are only in fair agreement with the Frantz and Marshall values at densities above 0.5 g‚cm -3 . Below 0.5 g‚cm -3 , the latter values are 0.5-2.5 log units higher than the new results.

Alkali feldspar dissolution and secondary mineral precipitation in batch systems: 3. Saturation states of product minerals and reaction paths

“…For aqueous species other than H 2 O, the standard state is the unit activity of the species in a hypothetical one molal solution referenced to infinite dilution at the T and P of interest. Standard state thermodynamic properties for mineral end-members were taken from Holland and Powell (1998) except for boehmite (see Appendix A), for water from Haar et al (1984), for Al-bearing aqueous species from Tagirov and Schott (2001), KCl°( aq) from Ho et al (2000), and all other aqueous species from Shock and Helgeson (1988), Shock et al (1989Shock et al ( , 1997, and Sverjensky et al (1997) (Table 1a). The T and P dependences of thermodynamic properties for aqueous species, when applicable, were predicted using the parameters of the revised HKF equations of state for aqueous species (Helgeson et al, 1981;Tanger and Helgeson, 1988;Shock et al, 1992).…”

“…(1) Haar et al (1984); (2) Tagirov and Schott (2001); (3) Sverjensky et al (1997); (4) Shock (1995); (5) Shock and Koretsky (1993); (6) McCollom and Shock (1997); (7) Ho et al (2000); (8) Holland and Powell (1998) for minerals and (1), (2), and (3) for aqueous species; (9) Hemingway et al (1991) for boehmite; (10) Alekseyev et al (1997).…”

Nernst–Planck modeling of multicomponent ion transport in a Nafion membrane at high current density

“…Also, this study is at a high concentration of the electrolyte solution which is not known to cause water dissociation. [13,33,34] For the boundary condition, the flux of species at the steady-state should be equal at the membrane and solution interface which is shown in Eq. (10) for anode interface.…”

Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

“…(1) Haar et al (1984); (2) Tagirov and Schott (2001); (3) Sverjensky et al (1997); (4) McCollom and Shock (1997); (5) Ho et al (2000); (6) Holland and Powell (1998) for minerals and (1), (2), and (3) for aqueous species; (7) Hemingway et al (1991) for boehmite; (8) Alekseyev et al (1997). first term is equivalent to Eq. (4) if n 1 = p, m 1 = 1, and q = 1.…”