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Isopiestic molalities for aqueous solutions of the alkali metal hydroxides at elevated temperatures

โœ Scribed by H.F. Holmes; R.E. Mesmer

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
216 KB
Volume
30
Category
Article
ISSN
0021-9614

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โœฆ Synopsis

Isopiestic molalities of aqueous solutions of the alkali metal hydroxides have been measured ลฝ . at T s 383.25, 413.12, and 443.09 K. The isopiestic standard for calculation of osmotic ลฝ . coefficients was NaCl aq . The ion-interaction model gave an excellent fit with the experimental osmotic coefficients and provided parameters for the calculation of activity coefficients. Osmotic and activity coefficients both decrease with increasing temperature in this temperature range. As at T s 298.15 K, the order of the results is the reverse of that for ลฝ the alkali metal chlorides. The model of Simonson et al. J. Chem. Thermodynamics 1989, 21, . ลฝ . 561แŽ584 is an excellent predictor of the experimental results for NaOH aq . A simple model ลฝ . is presented from which activity and osmotic coefficients at p can be calculated as a sat function of molality for T s 273.15 K to T s 523.15 K.

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