Abstract
The audio electrical conductances of aqueous solutions of magnesium, manganese II, barium, and copper succinates have been measured at various temperatures in the range of 298.15 K to 313.15 K, using an audio frequency conductance bridge. The evaluation of conductance data was carried out by minimisation technique using the theoretical equations of the complete and modified forms of Pitts (P) and Fuoss-Hsia (F-H), each a three-parameter equation, association constant (KA), molar conductance (Λm), and distance parameter (a). Quantitative results showed that these salts do not behave as “strong” electrolytes, and that their dissociations are far from complete. The abnormally low conductances of these electrolytes are not due to the presence of electrically neutral molecules but to the ion-pair formation. The Walden product values, as well as the standard thermodynamics functions (ΔH∘,ΔG∘,ΔS∘) for the association reaction at the four temperatures studied, have been evaluated.
Highlights
E conductance of any electrolyte at in nite dilution is generally recognised to be dependent upon temperature, viscosity, and dielectric constant
In part I of this paper, we report conductance measurement of magnesium, manganese II, barium, and copper succinates in aqueous medium at various temperatures in the range 298.15–313.15 K
Magnesium succinate was prepared by addition of clean and dried magnesium ribbon to a solution of succinic acid. e PH of solution was continuously tested until the solution became neutral. en the mixture was ltered to remove the excess of metal added, a er which the solvent was evaporated on a water bath. e product was recrystallized twice from conductivity water and dried by air at room temperature. e nal product was a white crystalline powder as the tetrahydrate. e composition of the salt was determined by elemental analysis. e salt was further analysed for magnesium by titration with the disodium salt of ethylenediaminetetraacetic acid (EDTA) using eriochrome black T as indicator [10]
Summary
E conductance of any electrolyte at in nite dilution is generally recognised to be dependent upon temperature, viscosity, and dielectric constant. It is well established that the extent of association of a series of electrolytes in di erent solvents is speci c for any ion-solvent combination, rather than being dielectric constant dependent. In a series of conductance studies, there have been numerous investigations of association behavior of 1 : 1 electrolytes in aqueous and binary mixed solvents. In part I of this paper, we report conductance measurement of magnesium, manganese II, barium, and copper succinates in aqueous medium at various temperatures in the range 298.15–313.15 K. The thermodynamic parameters ΔHH∘, ΔGG∘, and ΔSS∘ were evaluated by investigating the process over a certain temperature range.
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