Authors : N. M. Singh* , Lalrosanga
Page Nos : 1215-1224
Description :
Electrical conductivity measurements of methyl bis-1-amidino-O-mehtylurea nickel (II) bromide and methyl bis-1-amidino-O-mehtylurea nickel (II) iodide have been measured in aqueous solution at 288.15-318.15K. The limiting molar conductance (Ʌ0) and the association constant (KA) have been analyzed by Shedlovsky technique for the electrolytes. For both salts, limiting equivalent conductances have been increased with raise in temperature. The KA values decrease with rise in temperature until the KA(min) is reached at a particular temperature (tmin). Before tmin, the KA values for both salts decrease gradually and after tmin, the KA values increase gradually. The thermodynamic parameters viz., changes in free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) have been evaluated to understand the change of the association constants with aqueous medium. The results have been discussed in terms of ion-ion, ion-solvent and solvent-solvent interactions.
