Viscosity and Related Quasi Thermodynamic Properties of Alkali Metal Salts In 10%(W/W) 2-(Ethoxy) Ethanol - Water Mixture

Relative viscosities of NaCl, KCl, KBr, RbCl, KI in 10% (W/W) 2-(Ethoxy) ethanol - water mixture are measured at 30o , 35o and 40oC. Joules-Dole equation is used to analyze the data to calculate B-coefficients. Transition state theory is applied to calculate Enthalpy activation of viscous flow ( H-20# ) and entropy of activation of viscous flow ( S20# ). The temperature coefficients of ( H20# ) , ( S2 0 #) and B-coefficients show that in the present solvent system Na+ is a structure making ion while K+. Rb+, Cl-, Br-, I- are structure breaking ions. An attempt is made to split the enthalpy and entropy values of the electrolytes into their ionic contributions. Solute-solvent interaction parameter ( ) , solvation numbers and ionic volumes are also calculated. These values support the conclusions drawn from H-20# and S20# . Dimensions of the ions are calculated from the viscosity B-coefficients and are compared with Pauling’s crystal radius of the ions.