Thermodynamic investigation of the ternary mixed electrolyte (COCl2 + CoSO4 + H2O) system by EMF measurements at T=298.15 K

Pournaghdy, Mohammad; Aghaie, Hossein; MONAJJEMI, Majıd; Giahi, Masoud; Bagherinia, Mohammad A.

doi:10.1016/j.jct.2010.07.012

Thermodynamic investigation of the ternary mixed electrolyte (COCl₂ + CoSO₄ + H₂O) system by EMF measurements at T=298.15 K

Yazarlar (5)

Mohammad Pournaghdy Islamic Azad University, Science And Research Branch, İran

Hossein Aghaie Islamic Azad University, Science And Research Branch, İran

Prof. Dr. Majıd MONAJJEMI Islamic Azad University, Science And Research Branch, İran

Masoud Giahi Islamic Azad University, Lahijan Branch, İran

Mohammad A. Bagherinia Islamic Azad University, Lahijan Branch, İran

Makale Türü	Özgün Makale (ESCI dergilerinde yayınlanan tam makale)
Dergi Adı	Journal of Chemical Thermodynamics
Dergi ISSN	0021-9614 Wos Dergi Scopus Dergi
Makale Dili	İngilizce	Basım Tarihi	12-2010
Cilt / Sayı / Sayfa	42 / 12 / 1494–1499	DOI	10.1016/j.jct.2010.07.012
Makale Linki	http://www.scopus.com/inward/record.url?eid=2-s2.0-77956226460&partnerID=MN8TOARS

Özet

In this work, the ternary mixed electrolyte system (CoCl2 + CoSO4 + H2O) was investigated based on the Pitzer ion-interaction model by using the potentiometric technique at T = 298.15 K. The mean activity coefficients of CoCl2 in the mixed aqueous electrolyte system were determined on the galvanic cell without liquid junction of the type: Co-ISE|CoCl2 (mA), CoSO4 (mB), H2O|Ag/AgCl over total ionic strengths from (0.001 to 6.000) mol · kg^-1 for different series of salt ratio r (r=mCoCl2/mCoSO4=1.00,2.50,5.00,10.00 and pure). The PVC based cobalt ion-selective electrode (Co-ISE) and the Ag/AgCl electrode used in this work were made in our laboratory and had a reasonably good Nernst response. The experimental results obeyed the Harned rule, and the Pitzer model could be used to describe this ternary system satisfactorily. Furthermore, the parameters obtained with the Pitzer model (θClSO4=0.0719±0.0099,ψCoClSO4= 0.0088±0.0003) were used to calculate the values of the mean activity coefficients of CoSO4, the osmotic coefficients of water (φ) and the excess Gibbs free energies of solution (G^E) for the whole series of the studied electrolyte systems. © 2010 Elsevier Ltd. All rights reserved.

Anahtar Kelimeler

CoCl2 | CoSO4 | EMF | Mean activity coefficients | Pitzer model

Science Direct

BM Sürdürülebilir Kalkınma Amaçları

Atıf Sayıları
Web of Science	18
Scopus	19

Thermodynamic investigation of the ternary mixed electrolyte (COCl₂ + CoSO₄ + H₂O) system by EMF measurements at T=298.15 K

Dergi Adı	JOURNAL OF CHEMICAL THERMODYNAMICS
Yayıncı	Academic Press
Açık Erişim	Hayır
ISSN	0021-9614
E-ISSN	1096-3626
CiteScore	5,5
SJR	0,470
SNIP	0,868

Thermodynamic investigation of the ternary mixed electrolyte (COCl2 + CoSO4 + H2O) system by EMF measurements at T=298.15 K

Paylaş

Thermodynamic investigation of the ternary mixed electrolyte (COCl₂ + CoSO₄ + H₂O) system by EMF measurements at T=298.15 K