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

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/S0016-7037(97)00146-4· OSTI ID:586812

Ho, P C; Palmer, D A ^[1]

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1. Oak Ridge National Lab., TN (United States)

The limiting molar conductances ({Lambda}{sub 0}) and ion association constants of dilute (<0.01 mol {center_dot}kg{sup -1}) aqueous potassium chloride and hydroxide solutions were determined by electrical conductance measurements from 200 to 600{degrees}C and from 100 to 600{degrees}C, respectively, and pressures up to 300 MPa. The limiting molar conductances of KOH{sub (aq)} increase with increasing temperature up to 300{degrees}C and decreasing density. Above 400{degrees}C and densities between 0.8 and 0.4 g{center_dot}cm{sup -3} for KCl{sub (aq)} and between 0.8 and 0.6 g{center_dot}cm{sup -3} for KOH{sub (aq)}, {Lambda}{sub 0} is nearly temperature-independent but increases linearly with decreasing density. The molal ion association constants (K{sub A}(m)) for both KCl{sub (aq)} and KOH{sub (aq)} increase with increasing temperature and decreasing solution density. At corresponding temperatures and densities, ion association of KCl{sub (aq)} is similar in extent to NaCl{sub (aq)}, whereas for KOH{sub (aq)} the values are slightly lower than for NaOH{sub (aq)}. 35 refs., 8 figs., 8 tabs.

• OSTI ID: 586812
• Journal Information: Geochimica et Cosmochimica Acta, Vol. 61, Issue 15; Other Information: PBD: Aug 1997
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
58 GEOSCIENCES
ELECTRIC CONDUCTIVITY
POTASSIUM CHLORIDES
THERMOCHEMICAL PROCESSES
GEOCHEMISTRY
POTASSIUM HYDROXIDES