Conductance And Ion-Association Studies Of Lipic In (PC+THF) At Different Mixtures
Dr. Ashoke Hazra
Key words: conductance, ion-association constant, limiting equivalent conductance, Li-Picrate, (PC+THF) mixture, solubility,temperature.
Abstract: Conductance of Li-Picrate was measured in different temperatures (250C, 350C, 450C). The limiting equivalent conductance (0) and the ion-association constant (KA) for Li-Picrate in ( PC+THF ) solvents at different percentage were evaluated using Debye-Huckel Onsager equation. It is observed that the limiting equivalent conductance increased linearly with the increase in temperature and the association constant values decreased with rise in temperature. Thermodynamic parameters (i.e, G0 , H0 , S0 ) are estimated from the temperature dependence of the ion-association constant . The positive values of S0 and positive values of H0 indicate the ion-association process occurred spontaneously as well as endothermic at all respective temperature. Supported by absorbance data from this primary study, it may be concluded that room temperature solubility of Li-Picrate in mixed ( PC+THF ) solvents at different percentage is higher than the higher temperatures. Conductivity data helps us to concluded that if we go from room temperature to higher temperature conductance increases for Li-Picrate in ( PC+THF ) solvents at different percentage. It is due to the switch over of ion-pair to ionic dissociation of Li-Picrate salt.
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