Aqueous guanidinium salts: Part II. Isopiestic osmotic coefficients of guanidinium sulphate and viscosity and surface tension of guanidinium chloride, bromide, acetate, perchlorate and sulphate solutions at 298.15 K

The molality dependence of isopiestic osmotic coefficients of aqueous guanidinium sulphate, Gn2SO4 has been reported at 298.15 and analysed by the Pitzer equations. The Pitzer coefficients obtained from the analysis of osmotic coefficients are employed to calculate the activity coefficients. The viscosity and surface tension of aqueous guanidinium chloride (GnCl), bromide (GnBr), acetate (CH3COOGn), perchlorate (GnClO4) and sulphate (Gn2SO4) have also been measured at 298.15 K. The order in which these salts increase the viscosity and surface tension of water is: Gn2SO4>CH3COOGn>GnCl>GnBr>GnClO4. The effect of Gn2SO4 and CH3COOGn on the viscosity and surface tension is stronger than that of other guanidinium salts.