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Densities and apparent molar volumes ofGd(CF3SO3)3(aq)atT = (373, 423, and 472) K andp =  (7and 26) MPa

✍ Scribed by Caibin Xiao; J.M. Simonson; Peter R. Tremaine

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
369 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

Densities of Gd(CF 3 SO 3 ) 3 (aq) solutions with molalities between (0.058 and 0.72) mol β€’ kg -1 were measured with a vibrating-tube densimeter at the temperatures (373, 423, and 473) K and pressures (7 and 26) MPa. Apparent molar volumes calculated from measured densities in this work and those at ambient conditions reported previously by us were represented with the Pitzer ion-interaction treatment. The temperature and pressure dependence of the standard partial molar volume and the virial coefficients in the Pitzer equation were expressed by empirical functions in which the compressibility of water was used as an independent variable. The conventional standard partial molar volume V o m (Gd 3+ , aq) from T = 278 K to T = 473 K was calculated from V o 2,m {Gd(CF 3 SO 3 ) 3 , aq} and V o m (CF 3 SO - 3 , aq).

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