Conductometric and thermodynamic studies on the ionic association of HCOONH4, phCOONH4, HCOONa and phCOONa in aqueous–organic solvents |
| |
Authors: | Farid I. El-Dossoki |
| |
Affiliation: | aChemistry Department, Faculty of Science, Suez-Canal University, Port Said, Egypt |
| |
Abstract: | The specific conductance of ammonium formate, ammonium benzoate, sodium formate and sodium benzoate in (10%, 20% and 30% (W/W)) methanol–water, ethanol–water and glycerol–water mixtures at different temperatures (293, 298, 303 and 308 K) was measured.The molar conductance (Λ), limiting molar conductance (Λ0), limiting ionic conductance (λ0), association constants (KA), the activation energy of the transport process (Ea), Walden product (Λ0η0), hydrodynamic radii (1/rs+ + 1/rs−)− 1, transfer numbers of the studied ions (t), standard thermodynamic parameters of association (ΔGA, ΔHA and ΔSA) were calculated and discussed.The results show that, the molar conductance and the limiting molar conductance values were decreased as the relative permittivity of the solvent decreased while, the association constant increased. Also the results show that the molar conductance, the limiting molar conductance and the association constant values were increased as the temperature increased indicating that the association process is an endothermic one. |
| |
Keywords: | Molar conductance Association Hydrodynamic radii |
本文献已被 ScienceDirect 等数据库收录! |
|