Thermodynamic determination of solvation potentials of divalent metal chlorides (MCl2) in iso-dielectric media by EMF measurements

Manjula Spah; Dal Chand Spah; Joonho Lee; Ho Jun Song; Jin Won Park

doi:10.1016/j.jct.2009.01.003

Thermodynamic determination of solvation potentials of divalent metal chlorides (MCl₂) in iso-dielectric media by EMF measurements

Manjula Spah, Dal Chand Spah, Joonho Lee, Ho Jun Song, Jin Won Park

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Cell potentials (EMF) of metal chlorides (CoCl₂ and CuCl₂) were measured at T = (303.15 and 313.15) K on the cell: M_X Hg|MCl₂ (m) in solvent S|AgCl-Ag, where S = water or iso-dielectric media with water of FD + DMF or FD + D. Stock solutions of metal chlorides were prepared by mass in water/iso-dielectric solvents. There was a change in the EMF values in these iso-dielectric media from its pure components. This change of EMF was associated with the change of ion-solvent interactions and was explained on the basis of kinetics of electrode processes. Equilibrium constants (K₁ and K₂) as well as the degrees of dissociation (α₁ and α₂) values for two step dissociation of metal chlorides in these solvents were obtained by iterative procedures. The standard electrode potential (E°) values of the above cell were calculated in these solvents, and same were used to get the mean ionic activity coefficients (γ_±) and standard thermodynamic functions (ΔG°, ΔH°, and ΔS°) of MCl₂. The E° values were also used to compute the standard molar Gibbs free energy of transfer (Δ G_tr^{{ring operator}}) and other transfer thermodynamic parameters (Δ H_tr^{{ring operator}} and Δ S_tr^{{ring operator}}) of MCl₂ from water to iso-dielectric media.

Original language	English
Pages (from-to)	598-603
Number of pages	6
Journal	Journal of Chemical Thermodynamics
Volume	41
Issue number	5
DOIs	https://doi.org/10.1016/j.jct.2009.01.003
Publication status	Published - 2009 May

Bibliographical note

Funding Information:
One of the authors (D. C. Spah) thanks the Korea Federation of Science and Technology Societies (KOFST) for funding this work under its Brain Pool program, and to the Govt. of Haryana, India for allowing him to join this prestigious fellowship.

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
Materials Science(all)
Physical and Theoretical Chemistry

Access to Document

10.1016/j.jct.2009.01.003

Cite this

@article{60ff718fe1b643279e278fa494008519,

title = "Thermodynamic determination of solvation potentials of divalent metal chlorides (MCl2) in iso-dielectric media by EMF measurements",

abstract = "Cell potentials (EMF) of metal chlorides (CoCl2 and CuCl2) were measured at T = (303.15 and 313.15) K on the cell: MX Hg|MCl2 (m) in solvent S|AgCl-Ag, where S = water or iso-dielectric media with water of FD + DMF or FD + D. Stock solutions of metal chlorides were prepared by mass in water/iso-dielectric solvents. There was a change in the EMF values in these iso-dielectric media from its pure components. This change of EMF was associated with the change of ion-solvent interactions and was explained on the basis of kinetics of electrode processes. Equilibrium constants (K1 and K2) as well as the degrees of dissociation (α1 and α2) values for two step dissociation of metal chlorides in these solvents were obtained by iterative procedures. The standard electrode potential (E°) values of the above cell were calculated in these solvents, and same were used to get the mean ionic activity coefficients (γ±) and standard thermodynamic functions (ΔG°, ΔH°, and ΔS°) of MCl2. The E° values were also used to compute the standard molar Gibbs free energy of transfer (Δ Gtr{ring operator}) and other transfer thermodynamic parameters (Δ Htr{ring operator} and Δ Str{ring operator}) of MCl2 from water to iso-dielectric media.",

author = "Manjula Spah and Spah, {Dal Chand} and Joonho Lee and Song, {Ho Jun} and Park, {Jin Won}",

note = "Funding Information: One of the authors (D. C. Spah) thanks the Korea Federation of Science and Technology Societies (KOFST) for funding this work under its Brain Pool program, and to the Govt. of Haryana, India for allowing him to join this prestigious fellowship. ",

year = "2009",

month = may,

doi = "10.1016/j.jct.2009.01.003",

language = "English",

volume = "41",

pages = "598--603",

journal = "Journal of Chemical Thermodynamics",

issn = "0021-9614",

publisher = "Academic Press Inc.",

number = "5",

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T1 - Thermodynamic determination of solvation potentials of divalent metal chlorides (MCl2) in iso-dielectric media by EMF measurements

AU - Spah, Manjula

AU - Spah, Dal Chand

AU - Lee, Joonho

AU - Song, Ho Jun

AU - Park, Jin Won

N1 - Funding Information: One of the authors (D. C. Spah) thanks the Korea Federation of Science and Technology Societies (KOFST) for funding this work under its Brain Pool program, and to the Govt. of Haryana, India for allowing him to join this prestigious fellowship.

PY - 2009/5

Y1 - 2009/5

N2 - Cell potentials (EMF) of metal chlorides (CoCl2 and CuCl2) were measured at T = (303.15 and 313.15) K on the cell: MX Hg|MCl2 (m) in solvent S|AgCl-Ag, where S = water or iso-dielectric media with water of FD + DMF or FD + D. Stock solutions of metal chlorides were prepared by mass in water/iso-dielectric solvents. There was a change in the EMF values in these iso-dielectric media from its pure components. This change of EMF was associated with the change of ion-solvent interactions and was explained on the basis of kinetics of electrode processes. Equilibrium constants (K1 and K2) as well as the degrees of dissociation (α1 and α2) values for two step dissociation of metal chlorides in these solvents were obtained by iterative procedures. The standard electrode potential (E°) values of the above cell were calculated in these solvents, and same were used to get the mean ionic activity coefficients (γ±) and standard thermodynamic functions (ΔG°, ΔH°, and ΔS°) of MCl2. The E° values were also used to compute the standard molar Gibbs free energy of transfer (Δ Gtr{ring operator}) and other transfer thermodynamic parameters (Δ Htr{ring operator} and Δ Str{ring operator}) of MCl2 from water to iso-dielectric media.

AB - Cell potentials (EMF) of metal chlorides (CoCl2 and CuCl2) were measured at T = (303.15 and 313.15) K on the cell: MX Hg|MCl2 (m) in solvent S|AgCl-Ag, where S = water or iso-dielectric media with water of FD + DMF or FD + D. Stock solutions of metal chlorides were prepared by mass in water/iso-dielectric solvents. There was a change in the EMF values in these iso-dielectric media from its pure components. This change of EMF was associated with the change of ion-solvent interactions and was explained on the basis of kinetics of electrode processes. Equilibrium constants (K1 and K2) as well as the degrees of dissociation (α1 and α2) values for two step dissociation of metal chlorides in these solvents were obtained by iterative procedures. The standard electrode potential (E°) values of the above cell were calculated in these solvents, and same were used to get the mean ionic activity coefficients (γ±) and standard thermodynamic functions (ΔG°, ΔH°, and ΔS°) of MCl2. The E° values were also used to compute the standard molar Gibbs free energy of transfer (Δ Gtr{ring operator}) and other transfer thermodynamic parameters (Δ Htr{ring operator} and Δ Str{ring operator}) of MCl2 from water to iso-dielectric media.

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