Thermodynamics of ion pair in mixed solvents: II. The system (HCl + MgSO 4) in {0.06455C 2H 5OH + 0.93545H 2O}

The standard association constants of the ion pair [MgSO 4] 0, K ass, in the {0.06455 ethanol + 0.93545 water} were determined from precise e.m.f. measurements of cell (I) without liquid junction: (I) Pt , H 2 ( 101.325 kPa ) | HCl ( m 1 ) , MgSO 4 ( m 2 ) , ( 0.06455 ethanol + 0.93545 water ) | AgC...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2006, Vol.38 (1), p.5-9
Main Authors: Lu, Xing-Mei, Xu, Wei-Guo, Chang, Xiao-Hong, Lu, Dian-Zhen, Yang, Jia-Zhen
Format: Article
Language:English
Subjects:
Association constant
Chemical thermodynamics
Chemistry
Ethanol
Exact sciences and technology
General and physical chemistry
Ion pair
MgSO 4
Mixed solvent
Mixtures
Thermodynamic properties
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Summary:The standard association constants of the ion pair [MgSO 4] 0, K ass, in the {0.06455 ethanol + 0.93545 water} were determined from precise e.m.f. measurements of cell (I) without liquid junction: (I) Pt , H 2 ( 101.325 kPa ) | HCl ( m 1 ) , MgSO 4 ( m 2 ) , ( 0.06455 ethanol + 0.93545 water ) | AgCl - Ag , where m i means molality of species i. The dependence of p K ass on temperature T is expressed by the empirical equations: p K ass = a 1 + a 2( K/ DT). The other thermodynamic functions of the association process were also calculated and showed that the driving force for the formation of the ion pair is the entropy of association.
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2004.12.013