The dissociation constants of 2,4,6-trinitrophenol (picric acid) in a set of ethane-1,2-diol–water mixtures have been determined by the conductometric method at temperatures ranging from –10 to 80 °C. The experimental k values exhibit a regular trend, with a relative maximum in the investigated temperature range for all the binary solvent systems, and they are well fitted by an equation of the type ln K=a0+a1T+a2/T+a3 ln T. In order to verify the reliability of Kmax values, a series of correlations was made, on the basis of the above equation, of Harned's theory and of a pKvs. 1/ε plot; all the methods provide results consistent with each other. Furthermore, two empirical equations for the functions K=K(χ) and K=K(T,χ) are proposed in order to try to predict the K values of the studied solute over the whole variation of the investigated T and χ. Both these model equations allow us to extrapolate the K values of picric acid in pure water solution, in which conductometric and potentiometric methods are unable to give consistent values.

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. - In: JOURNAL OF THE CHEMICAL SOCIETY. FARADAY TRANSACTIONS I. - ISSN 0300-9599. - ELETTRONICO. - 84:(1988), pp. 4427-4438. [10.1039/F19888404427]

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
1988

Abstract

The dissociation constants of 2,4,6-trinitrophenol (picric acid) in a set of ethane-1,2-diol–water mixtures have been determined by the conductometric method at temperatures ranging from –10 to 80 °C. The experimental k values exhibit a regular trend, with a relative maximum in the investigated temperature range for all the binary solvent systems, and they are well fitted by an equation of the type ln K=a0+a1T+a2/T+a3 ln T. In order to verify the reliability of Kmax values, a series of correlations was made, on the basis of the above equation, of Harned's theory and of a pKvs. 1/ε plot; all the methods provide results consistent with each other. Furthermore, two empirical equations for the functions K=K(χ) and K=K(T,χ) are proposed in order to try to predict the K values of the studied solute over the whole variation of the investigated T and χ. Both these model equations allow us to extrapolate the K values of picric acid in pure water solution, in which conductometric and potentiometric methods are unable to give consistent values.
84
4427
4438
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. - In: JOURNAL OF THE CHEMICAL SOCIETY. FARADAY TRANSACTIONS I. - ISSN 0300-9599. - ELETTRONICO. - 84:(1988), pp. 4427-4438. [10.1039/F19888404427]
Franchini, Giancarlo; Marchetti, Andrea; Tassi, Lorenzo; Tosi, Giuseppe
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/741158
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