Determination of Thermodynamic Equilibrium Constants in Mixed Solvents

Uitert, L. G. Van; Fernelius, W. Conard

doi:10.1021/ja01651a110

Cited by 53 publications

(28 citation statements)

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“…The glass electrode was equilibrated in a well-stirred PG-water mixture containing an inert electrolyte. The effects of variations in the asymmetry potential, liquid junction potential, activity coefficient, sodium ion error and dissolved carbon dioxide on the response of the glass electrode were accounted for in the form of correction factor (Gonzalez et al, 1986;Van Uitert and Haas, 1953).…”

Section: Apparatusmentioning

confidence: 99%

Chemical speciation of 2,3-dihydroxybenzoic acid complexes with some biologically essential metal ions in 1, 2-propanediol–water mixtures

Hirpaye

Rao

2013

Chemical Speciation & Bioavailability

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Chemical speciation of Co(II), Ni(II), Cu(II) and Zn(II) complexes of 2,3-dihydroxybenzoic acid in 0.0-60.0% v/v 1, 2-propanediol-water mixtures maintaining an ionic strength of 0.16 mol dm -3 at 303±0.1 K has been studied pH metrically. The predominant complexes formed are ML, ML 2 and ML 2 H 2 for Co(II), Ni(II) and Zn(II) and ML, ML 2 , ML 2 H and ML 2 H 2 for Cu(II). Models containing different numbers of species were refined by using the computer program MINIQUAD75. Selection of the best fit chemical models was based on statistical parameters and residual analysis. The trend in variation of complex stability constants with dielectric constant of the medium is explained on the basis of electrostatic and non-electrostatic forces. Distributions of species, formation equilibria and effect of influential parameters on the stability constants have been presented. The possible structures of the various species are elucidated on the basis of the analysis of the pH-metric data.

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Section: Apparatusmentioning

confidence: 99%

Chemical speciation of 2,3-dihydroxybenzoic acid complexes with some biologically essential metal ions in 1, 2-propanediol–water mixtures

Hirpaye

Rao

2013

Chemical Speciation & Bioavailability

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“…Hence the difference between the experimentally observed pH in solvent medium and the pH calculated based on the concentrations of the ingredients is used as factor that accounts for all the above parameters. This factor is named as correction factor in complex equilibria [31]. The correction factor is subtracted from pH meter dial reading.…”

Section: Methodsmentioning

confidence: 99%

Stability of binary complexes of L-aspartic acid in dioxan–water mixtures

Rani¹,

Rao²

2013

Bull. Chem. Soc. Eth.

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ABSTRACT. Speciation of binary complexes of Co(II), Ni(II) and Cu(II) with L-aspartic acid in (0-60% v/v) 1,4-dioxan (Dox)-water mixtures was studied pH metrically at 303±0.1 K and at an ionic strength of 0.16 M. The models contained ML, ML2, ML2H2, ML2H3 and ML2H4 species. The trend in the variation of stability constants with Dox content was explained on the basis of electrostatic and non-electrostatic forces. Distribution of the species with pH at different compositions of Dox-water media was also presented.

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“…The binary excess quantity of density for the 2-PE+TMS system is not taken into account, since it is supposed that the characteristics of both solvents are similar. The excess quantity of density for other binary solvents in a mixed solvent, A P~,~, is empirically correlated as follows : (10) where Tg1,2,3 has the same formulation as eqn (9), and 4t…”

Section: Density and Viscositymentioning

confidence: 99%

The physicochemical properties of the mixed solvent of 2‐piperidineethanol, sulfolane and water

Wang

Otto

et al. 1993

J of Chemical Tech & Biotech

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Abstract:The physicochemical properties of the mixed solvent of 2-piperidineethanol (2-PE), sulfolane (TMS) and water were determined over a wide range of temperatures and compositions. The density, the viscosity and the dissociation constant, as well as the solubility of N,O in this mixed solvent were correlated as a function of temperature and composition over the entire experimental range. The models are useful not only for the ternary solvent system, but also for the binary solvent systems, such as 2-PE+H20 and TMS+H,O. From the regression, it has been found that the interaction of aqueous 2-PE solution and aqueous TMS solution is negligible.

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Determination of Thermodynamic Equilibrium Constants in Mixed Solvents

Cited by 53 publications

References 0 publications

Chemical speciation of 2,3-dihydroxybenzoic acid complexes with some biologically essential metal ions in 1, 2-propanediol–water mixtures

Chemical speciation of 2,3-dihydroxybenzoic acid complexes with some biologically essential metal ions in 1, 2-propanediol–water mixtures

Stability of binary complexes of L-aspartic acid in dioxan–water mixtures

The physicochemical properties of the mixed solvent of 2‐piperidineethanol, sulfolane and water

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