Interactions between Sulpha Drugs and Magnesium Chloride in Aqueous Solutions at T = (288.15 to 318.15) K: Volumetric and Viscometric Approach

The densities (rho) and viscosities (eta) for sulphanilamide, sulphanilic acid, and sulphosalicylic acid dihydrate in aqueous solutions of magnesium chloride hexahydrate (0.05, 0.1, 0.25, and 0.5) mol.kg(-1) at temperatures from (288.15 to 318.15) K have been measured by using vibrating tube digital densimeter and Micro-Ubbelohde type capillary viscometer, respectively. These data have been used to obtain partial molar volumes (V-2(0)) at infinite dilution and viscosity B coefficients. The present partial molar volumes and B-coefficient data in conjunction with that reported in water have further been used to calculate the corresponding transfer parameters (Delta V-tr(2)0 and Delta B-tr). The results have been compared with the data already reported for these drugs in aqueous sodium chloride solutions.