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

✍ Scribed by Marek Obšil; Vladimir Majer; Glenn T. Hefter; Vladimir Hynek

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
258 KB
Volume
29
Category
Article
ISSN
0021-9614

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✦ Synopsis

Vibrating tube densimetry was used to investigate volumetric properties of MgCl2(aq) at target molalities between 0.005 mol•kg -1 and 3 mol•kg -1 , at temperatures from 298 K to 623 K and pressures up to 30 MPa. The new data are correlated at constant T and p as 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.

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