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S. K. Gumtya, Sujit Chandra Lahiri

Calculation of Gibbs Energy of Interaction (ΔG⁰_int) of Neutral Benzoic Acids and their Anions

Quantitative correlation of the solubility phenomena and understanding of the dissolution mechanism are complex due to interplay of different types of intermolecular forces in the solubilization processes.
Attempts have been made to understand the solubilization process by determining the ΔG⁰_int terms for neutral benzoic acid and substituted benzoic acids using the solubility values of neutral acids reported from our laboratory and the scaled particle theory. Similarly, ΔG⁰_int terms for the anions are also calculated. ΔG⁰_int values for neutral (HA) and charged ions (A⁻) are opposite. Different aspects of solubility and dissociation processes for the substituted acids and the effects of substitution have been explained with success.
The limitations of the method have also been emphasized.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 219, 06/2005
Pages: 775 - 794

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