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Viscosity Behaviour of Aqueous Solutions of Amines

Measurements of viscosity of aqueous solutions of n-propyl-, -butyl, isobutyl and tert.-butylamine have been carried out at different concentrations (0.03—0.6 M) and at different temperatures (10—30°C). Viscosity coefficients found out by plotting specific viscosity against concentration are found to be positive and also decrease with temperature for all amines. The high value of coefficients are attributed to stabilization of water structure in the vicinity of the amine molecules. Estimates of the number of water molecules associated with the amine molecule, in the form of solvation or hydrophobic hydration, have been made by the use of Einstein's relation. The data of Sommerville [J. physic. Chem. 35 (1931) 2412] on the viscosity of methyland ethylamine in water have also been analyzed and the results discussed.