Szczegóły publikacji
Opis bibliograficzny
Solubility of pyromorphite $Pb_{5}(PO_{4})_{3}Cl$ at $5–65^{\circ}$C and its experimentally determined thermodynamic parameters / Justyna TOPOLSKA, Maciej MANECKI, Tomasz BAJDA, Olaf Borkiewicz, Przemysław Budzewski // Journal of Chemical Thermodynamics ; ISSN 0021-9614. — 2016 — vol. 98, s. 282–287. — Bibliogr. s. 287, Abstr. — Publikacja dostępna online od: 2016-03-19
Autorzy (5)
- AGHTopolska Justyna
- AGHManecki Maciej
- AGHBajda Tomasz
- Borkiewicz Olaf
- Budzewski Przemysław
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 99408 |
|---|---|
| Data dodania do BaDAP | 2016-08-11 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jct.2016.03.031 |
| Rok publikacji | 2016 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Chemical Thermodynamics |
Abstract
The solubility of synthetic pyromorphite Pb-5(PO4)(3)Cl was determined in a series of dissolution experiments conducted at 5-65 degrees C and at pH = 2.0. The equilibrium was established within 4 months. The dissolution of pyromorphite was congruent at all the temperatures, and the measured solubility product logK(sp, 298) for the dissolution reaction: Pb-5(PO4)(3)Cl double left right arrow 5Pb(2+) + 3PO(4)(3-) + Cl- was determined to be -79.6 +/- 0.15. The equilibrium ion activity product of pyromorphite increased with temperature, indicating a positive enthalpy of the dissolution reaction in the temperature range from 5 to 65 degrees C. The temperature dependence of the logKsp was nonlinear: logKsp = A - B/T + D log(T), where A = 478.77 +/- 136.62, B = 29,378 +/- 6215, and D = -185.81 +/- 46.77. This allowed for calculation of Delta G degrees(r) = 454.0 +/- 1.7 kJ . mol(-1), Delta H degrees(r) = 101.8 +/- 6.0 J . mol(-1) . K-1, Delta C degrees(p, r) = -1545 +/- 388.9 J . mol(-1) . K-1, and Delta S degrees(r) = -1181 +/- 382 J . mol(-1) . K-1 of the dissolution reaction. Using these values and the published standard state quantities for constituent ions, the values of Delta G degrees(f) = -3764.3 +/- 3.5 kJ . mol(-1), Delta H degrees(f) = -4108.4 +/- 7.9 J . mol(-1) . K-1, S degrees f = 622 +/- 382 J . mol(-1) . K-1, and C degrees pf = 402 +/- 398 J . mol(-1) . K-1 were calculated for synthetic pyromorphite Pb-5(PO4)(3)Cl. (C) 2016 Elsevier Ltd. All rights reserved.
