The relative viscosities of solutions of sodium and potassium chlorides and bromides in N-methylformamide at 25, 35, and 45°

Abstract

The relative viscosities of solutions of sodium and potassium chlorides and bromides in N-methylformamide have been determined at 25, 35, and 45°. Values of the coefficients A, B, and D in the extended Jones–Dole equation η_r= 1 +Ac^½+Bc+Dc², have been obtained after applying a solvent correction. The A-values are in fair agreement with those predicted from the interionic-attraction theory. The B-values are all positive, are additive for single ions, and decrease with increase in temperature. A comparison of the B-values with those for electrolytes in other organic solvents and in water allows a tentative general interpretation of the trends in these values from solvent to solvent to be made.