Viscometric and Thermodynamics Study of Bi-Univalent Mixed Electrolytes in Aqueous Solutions at 293.15,303.15 and 313.15 K

摘要

Viscosities (η) and apparent molar volumes (VΦ) of the solutions of bi-univalent mixed electrolytes in aqueous solutions have been determined at 293.15,303.15and 313.15 K. From these data the values of coefficients A and B of Jones-Dole equation and that of V_Φ~0 and Sv of Masson's equation have been obtained. Besides the activation thermodynamic quantities △μ_2~(0#), △H_2~(0#) and △S_2~(0#) of viscous flow have also been calculated. The variation of Φv with y, fraction of ionic strength due to the first electrolyte in the mixture of two electrolytes at different temperatures is linear. From η and Φv data, the values of coefficients A and B of Jones-Dole equation and that of V_Φ~0 and Sv of Masson's equation have been obtained. Besides the activation thermodynamic quantities △μ_2~(0#), △H_2~(0#) and △S_2~(0#) of viscous flow have also been calculated for the mixed electrolytes in aqueous solutions. It is seen that the values of △μ_2~(0#) are much larger as compared to those of △μ_1~(0#) for all the bi-univalent mixed electrolytes. The values of T△S_2~(0#) are negative while those of △H_2~(0#) are positive and that △H_2~(0#) > T△S_2~(0#). Thereby suggesting that ion-solvent interaction for the mixed electrolyte system, are nearly complete in the ground state. Further these the values of T△S_2~(0#) and △H_2~(0#) indicate the transition state is associated with the bond breaking and increase in order.