Volumes of MgCl2(aq) at temperatures from 298 K to 623 K and pressures up to 30 MPa

M. Obsil; V. Majer; G. Hefter; V. Hynek

doi:10.1006/jcht.1996.0175

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Volumes of MgCl2(aq) at temperatures from 298 K to 623 K and pressures up to 30 MPa

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Volumes of MgCl2(aq) at temperatures from 298 K to 623 K and pressures up to 30 MPa

M. Obsil, V. Majer, G. Hefter and V. Hynek

Journal of Chemical Thermodynamics, Vol.29(5), pp.575-593

1997

DOI: https://doi.org/10.1006/jcht.1996.0175

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Abstract

Vibrating tube densimetry was used to investigate volumetric properties of MgCl2(aq) at target molalities between 0.005 mol·kg−1and 3 mol·kg−1, at temperatures from 298 K to 623 K and pressures up to 30 MPa. The new data are correlated at constantTandpas a function of molality by the Pitzer equation in order to obtain partial molar volumes at infinite dilution. Volumes for MgCl2(aq) as a function of temperature and pressure are compared with those for other basic types of strong electrolytes. Data on association constants, volumes of ion-pairing, and activity coefficients, derived from information available in the literature, were used to calculate the degree of association in MgCl2(aq) as a function of molality and temperature. A modified form of the Pitzer equation was used to obtain a semiquantitative estimate of the partial molar volumes at infinite dilution for the ionized salt.

Details

Title: Volumes of MgCl2(aq) at temperatures from 298 K to 623 K and pressures up to 30 MPa
Authors/Creators: M. Obsil (Author/Creator)
V. Majer (Author/Creator)
G. Hefter (Author/Creator)
V. Hynek (Author/Creator)
Publication Details: Journal of Chemical Thermodynamics, Vol.29(5), pp.575-593
Publisher: Academic Press
Identifiers: 991005543888707891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.462 Excess Molar Volumes
Web Of Science research areas: Chemistry, Physical; Thermodynamics
ESI research areas: Chemistry