Ion association of dilute aqueous potassium chloride and potassium hydroxide solutions to 600°C and 300 MPa determined by electrical conductance measurements

Dissociation constants and speciation in aqueous Li2SO4 and K2SO4 from measurements of electrical conductance to 673K and 29MPa

“…A similar relation was found for KCl data (Wright et al, 1961;Hwang et al, 1970;Ho and Palmer, 1997;Sharygin et al, 2002) in the temperature range 550-670 K,…”

“…(26), (28), and (29). The limiting equivalent conductance of OH À , k 0 [OH À ], was calculated from an interpolation of the results of (Wright et al, 1961;Bianchi et al, 1994;Ho and Palmer, 1996;Ho and Palmer, 1997) using Marshall's equation.…”

Thermodynamic Modeling of Fluid-Rock Interaction at Mid-Crustal to Upper-Mantle Conditions

“…In the saline brines that may accompany metamorphism and melting in deepcrustal amphibolites and granulites (Touret 1985;Newton et al 1998;Aranovich et al 2013), NaCl is effectively completely dissociated (Aranovich and Newton 1996) (see below). Similar observations can be made for KCl (Aranovich and Newton 1997;Ho and Palmer 1997), as well as for AB 2 electrolytes such as CaCl 2 and MgCl 2 (Fig. 13) (Frantz and Marshall 1982).…”

“…Marshall and Quist 1967;Mesmer et al 1988;Anderson et al 1991). Numerous other dissociation reactions display similar behavior, including alkali-halide dissociation (Franck 1956;Quist and Marshall 1968b;Frantz and Marshall 1982;Ho and Palmer 1997), acid and base dissociation (Frantz and Marshall 1984;Mesmer et al 1988;Mesmer 1991;Ho and Palmer 1997), and the dissolution of oxide and halide minerals (Fournier and Potter 1982;Manning 1994;Caciagli and Manning 2003;Antignano and Manning 2008a,b;Dolejš and Manning 2010). Manning (1998) showed that logK values for homogeneous and heterogeneous equilibria derived from the HKF EOS also display linear correlations with 2 H O logρ at high P. Similar behavior was demonstrated for ∆G° for individual aqueous species.…”

“…For these solutions we can assume the presence of seven main aqueous species in solution: H + , OH − , K + , KOH (aq) , HAlO 2(aq) , AlO 2 − , and KAlO 2(aq) . The density model can be used to derive equilibrium constants from SUPCRT92 and Ho and Palmer (1997) at 700 °C, 10 kbar, for the following equilibria: (Wohlers and Manning 2009). Using these equilibrium constants, the logK for Equation (8) (Marshall and Franck 1981), the constraint of electrical neutrality, one of the ion-activity models, and known [K] total , the solubility of corundum in H 2 O and aqueous KOH solutions can be computed independent of the experiments by iterative solution of the resulting system of equations.…”