Frictional coefficients of aqueous solutions of choline chloride at 25°

Abstract

Frictional coefficients for the binary system H₂O–choline chloride have been calculated from experimentally determined diffusion coefficients, densities, and activity coefficients, and cover the concentration range 0·1 moles dm.^–3 to 1·6 moles dm.^–3 Using a modified form of Agar's equation which utilises diffusion, activity-coefficient, and relative viscosity data, the hydration number for choline chloride has been calculated to be 2·₁ which is in satisfactory agreement with the value of 2·₇ found from isopiestic data alone.