| | 1 | Author
| Heinz Gamsjäger1, Harald Marhold1, Erich Königsberger1, YiJung Tsai1, Hans Kolmer2 | Requires cookie* | | | Title
| S o lid - 3) 4 * **H20  | | | | Abstract
| S o lu te P h a s e E q u ilib ria in A q u e o u s S o lu tio n s IX . T h e rm o d y n a m ic A n a ly s is o f S o lu b ility M e a s u r e m e n ts : L a (0 H) M(C 0 Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday The aqueous solubilities of La(OH)p^(COaJjA 0.1 H20, basic lanthanum carbonate of ancylite type, have been investigated as a function of ionic strength at 25.0 °C. The stoichiometric solubility constants defined by log* K1 0 = log [La3 + ] + 1.1 log pco — 3 log [H+1 have the values 11.10, 11.32, 11.42, 11.63, and 11.70 for / = 0.1, 0.25, 1.0, 2.0, and 4.0 mol kg (Na)C104 respectively. The extrapolation to infinite dilution using the Pitzer equations resulted in a "thermodynamic" solubility constant, log* K° 0 = 10.48 ± 0.08. This in turn led to the Gibbs energy of ancylite formation: Af G f98 {La(OH)08(CO3)11 0.1 H20} = -1.531.5 kJ mol-1. | | | |
Reference
| Z. Naturforsch. 50a, 59—64 (1995); received October 1 1994 | | | |
Published
| 1995 | | | |
Keywords
| Solubility, Carbonates, Lanthanum, Thermodynamics, Pitzer model | | | |
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