Thermodynamics of the formation of solid solutions of the type (Me,Me′)SeO4·6H2O where Me and Me′ denote Mg, Co, Ni, or Zn from aqueous solutions

✍ Scribed by Christomir Christov

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 193 KB
• Volume: 29
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1996.0181

✦ Synopsis

The solutions (m1MgSeO4 + m2NiSeO4)(aq), (m1MgSeO4 + m2CoSe4)(aq), (m1ZnSeO4 + m2NiSeO4)(aq) and (m1ZnSeO4 + m2CoSeO4)(aq), where m denotes molality, have been simulated thermodynamically on the basis of the Pitzer model at the temperature T = 298.15 K. The thermodynamic functions needed (binary and ternary ion-interaction parameters and thermodynamic solubility products) have been determined and the standard molar Gibbs free energy of mixing DmixG°m(s) of the (Me,Me')SeO4•6H2O crystals has been calculated by two different methods. The results obtained are compared with the experimental data available in the literature. The reasons for the observed differences are given.