The ethane-1,2-diol–water solvent system. The dependence of the dissociation constant of picric acid on the temperature and composition of the solvent mixture

Franchini, Giancarlo; Marchetti, Andrea; Tassi, Lorenzo; Tosi, Giuseppe

doi:10.1039/f19888404427

Cited by 20 publications

(19 citation statements)

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“…The need to have an available K = K(T, function has been resolved, as already done in some previous papers (10)(11)(12), by suggesting an empirical approach which leads to:…”

Section: Resultsmentioning

confidence: 92%

“…A comparison among the various K = K(T, X) equations proposed in the present work and in previous studies (10)(11)(12) for similar solvent systems has been made by considering the criteria of the smallest difference between calculated and experimental values, of the simplest equation, and of the applicability to the largest number of solvent systems. This comparison has suggested that, in general, quite acceptable agreement between calculated and experimental values is achieved, even if the same equation may be employed with better results for the present system and for the previously studied GlietIGliem one.…”

Section: Discussionmentioning

confidence: 99%

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Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Marchetti¹,

Preti²,

Tagliazucchi³

et al. 1991

Can. J. Chem.

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Three empirical equations are proposed to fit the experimental values of the dissociation constant for picric acid, chosen as guide-solute working in the N, N-dimethylformamide/2-methoxyethanol solvent system. The work was performed operating at 19 temperatures ranging from − 10 to + 80 °C in the pure solvents and in their nine mixtures, identified by the mole fraction (X) of one component. This empirical treatment, which describes the dependence of the dissociation constant on temperature and composition of the solvent mixture, is represented by functions of the type K = K(T), K = K(X), and K = K(T, X). The K = K(T, X) equation in its complete form is composed of 20 terms, some of which can be eliminated because of small statistical weight; the number and type of these terms vary on passing from one solvent system to another and the best-fitting form is suggested. A comparison among various K = K(T, X) equations proposed in the present and in previous works has been made. Key words: dissociation equilibria, binary nonaqueous solvent mixtures, picric acid, N,N-dimethylformamide, 2-methoxyethanol.

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“…The need to have an available K = K(T, function has been resolved, as already done in some previous papers (10)(11)(12), by suggesting an empirical approach which leads to:…”

Section: Resultsmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Marchetti¹,

Preti²,

Tagliazucchi³

et al. 1991

Can. J. Chem.

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“…4 1 q W 2 , EDrW s 2r3 , and x f 0.66 for ME 1 q W 2 , MErW s 1r2 . 2 However, we notice from our previous papers Ž3, 7,8. that the temperature dependence < E < of V for the three binaries seems to be quite intriguing and is different for each < E < Ž .…”

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confidence: 96%

“…centred at x f 0.6 2ED 3W . 2 According to literature suggestions, Ž12,13. the position of the maximum deviations from ideality of the excess thermophysical properties such as those represented in figure 1 establishes approximately the stoichiometry of a probable solvent᎐ Ž .4 ⅷ, ED 1 q ME 2 ; ', ED 1 q W 2 ; B, ME 1 q W 2 .…”

mentioning

confidence: 99%

Densities and excess molar volumes of the solvent (ethane-1,2-diol + 2-methoxyethanol + water) fromT=263.15 K toT=353.15 K

Marchetti

Martignani

Tassi

1998

The Journal of Chemical Thermodynamics

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“…In previous papers, we have reported some studies about acid-base equilibria in ethane-1,2-diol (hereafter abbreviated ED) (Franchini et al, 1989) and 2-methoxyethanol (ME) (Preti et al, 1982); both the solvents are amphyprotic, potentially acidic media. They have been used as nonaqueous pure solvents, in their binary mixtures (Franchini et al, 1990) and in mixtures with water (Franchini et al, 1988;Marchetti et al, 1989). Now, we have in progress some investigations about amido-alcoholic solvent systems containing N,Ndimethylformamide (DMF), a quite dipolar protophylic, potentially basic solvent, and the above-mentioned ED and ME, in order to cover the largest variability range of nonthermodynamic properties.…”

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confidence: 99%

Kinematic viscosity studies of the binary ethane‐ 1,2‐diol/ n, n‐dimethylformamide solvent system at various temperatures

et al. 1993

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Kinematic viscosity data (v) are presented for ethane-I ,2-diol, for N,N-dimethylformamide and for nine binary mixtures in the -10°C to 80°C temperature range. The experimental data were fitted by several empirical relations such as Grunberg-Nissan (1949), McAllister (19601, Heric (1966), Lobe (1973), Auslander (1964 and polynomial equations. Some considerations regarding the meaning of the obtained adjustment parameters are made. Furthermore. a new best fit equation is proposed and its validity has been compared to that of the other relations on the basis of the reproducibility of the experimental data. _ _ ~~~~On prCsente des donnCes de viscositk cinkmatique (v) pour I'ethane-1, 2-dio1, le N, N-dimCthylformamide ainsi que pour neuf mClanges binaires dans une gamme de temperatures de -10 h 80°C. Les donnies expCrimentales ont it6 cakes a I'aide de plusieurs relations empiriques telles que celles de Grunberg-Nissan (1949), McAllister (1960. Heric (1966), Lobe (1973), Auslander (1964) et par des Cquations polynbmiales. Certaines considerations concernant la signification des parambtres de calage obtenus sont prksentees. En outre, on propose une meilleure Cquation de calage dont la validit6 est comparke i celle des autres relations par rapport h la reproducibiliti des donnCes exptrimentales.

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The ethane-1,2-diol–water solvent system. The dependence of the dissociation constant of picric acid on the temperature and composition of the solvent mixture

Cited by 20 publications

References 2 publications

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Densities and excess molar volumes of the solvent (ethane-1,2-diol + 2-methoxyethanol + water) fromT=263.15 K toT=353.15 K

Kinematic viscosity studies of the binary ethane‐ 1,2‐diol/ n, n‐dimethylformamide solvent system at various temperatures

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