Electric Conductivities of Aqueous Solutions Containing Various Salts and Alcohol-Water Solutions Containing Potassium Acetate

Abstract

The electric conductivities of aqueous solutions containing a single salt (LiCl, NaCl, KCl, CH₃COOK, CaCl₂, BaCl₂ and AlCl₃), two salts (NaCl?KCl, NaCl?CaCl₂, NaCl-AlCl₃, CaCl₂-BaCl₂, CaCl₂ - AlCl₃ and NaCl-CH₃COOK), and three salts (NaCl -LiCl-KCl, NaCl-LiCl?CaCl₂, NaCl?CaCl₂?BaCl₂, NaCl?CaCl₂?AlCl₃, CaCl₂ - BaCl₂-AlCl₃, NaCl-CH₃COOK-LiCl and NaCl-CH₂COOK-CaCl₂) were measured at 25°Cup to 0.3 mol·l^-1 of the salt. The electric conductivities of the methanol-water and the ethanol-water solutions containing CH₃COOK were also measured at 25°C up to 15 wt% of the salt.
From the present experimental data, it is found that the linear relationship between the molar conductivity and the square root of concentration is valid in the dilute region and that the law of the independent migration of ions proposed by Kohlrausch for the limiting molar conductivity can be extended to aqueous solutions containing various salts. The electric conductivity of the methanol-water solution at the same concentration of potassium acetate is larger than that of the ethanol-water solution, probably due to the larger dielectric constant of methanol.