The effects of CuCl_(2) and ZnCl_(2) on the viscosity in aqueous ethanol mixtures(10%–50%v/v)were studied in the concentration range 1.0×10^(–2)–8.0×10^(–2) mol·dm^(–3) at different temperatures.It...The effects of CuCl_(2) and ZnCl_(2) on the viscosity in aqueous ethanol mixtures(10%–50%v/v)were studied in the concentration range 1.0×10^(–2)–8.0×10^(–2) mol·dm^(–3) at different temperatures.It was found that the viscosities increased with an increase in the concentration of the salts and percent composition of ethanol content,whereas it decreased with an increase in temperature.Ion-ion and ion-solvent interactions are determined with the help of A-and B-coefficients of Jones-Dole equation.The values of A-and B-coefficients are irregular and increase with a rise in temperature and also with an increase in ethanol contents for both salts.Negative values of B-coefficients show that ion solvent interactions is comparatively small and suggest that CuCl_(2) and ZnCl_(2) behave as structure breakers in aqueous ethanol mixtures.Thermodynamic parameters like the energy of activation(Eη)and change in entropy of activation(ΔS*)were also evaluated which confirm the structure breaker behavior of salts in aqueous ethanol mixtures.展开更多
文摘The effects of CuCl_(2) and ZnCl_(2) on the viscosity in aqueous ethanol mixtures(10%–50%v/v)were studied in the concentration range 1.0×10^(–2)–8.0×10^(–2) mol·dm^(–3) at different temperatures.It was found that the viscosities increased with an increase in the concentration of the salts and percent composition of ethanol content,whereas it decreased with an increase in temperature.Ion-ion and ion-solvent interactions are determined with the help of A-and B-coefficients of Jones-Dole equation.The values of A-and B-coefficients are irregular and increase with a rise in temperature and also with an increase in ethanol contents for both salts.Negative values of B-coefficients show that ion solvent interactions is comparatively small and suggest that CuCl_(2) and ZnCl_(2) behave as structure breakers in aqueous ethanol mixtures.Thermodynamic parameters like the energy of activation(Eη)and change in entropy of activation(ΔS*)were also evaluated which confirm the structure breaker behavior of salts in aqueous ethanol mixtures.
