JOURNAL OF THE COLLEGE OF SOIENOE, IMPERIAL UNIVERSIT?, 

 TOKYO, JAPAN. 



VOL. XXV., ARTICLE 5. 



On the Viscosity of dilute Alcoholic 

 Solutions. 



By 

 Toshio Hirata, RigakusM. 



Aerhenius^^ has shown first that the viscosity of an aqueous 

 sokition containing any two indifferent dissolved substances can be 

 expressed with good results by the following exponential formula, 



z=A^B\ (1) 



where A and B are two constants characteristic of the substances 

 dissolved at a constant temperature, x and y being their respec- 

 tive volume percentages. Since z = l, when x~y = 0, the viscosity 

 thus expressed is the specific viscosity of the solution, where 

 the viscosity of the solvent is made unity. When only one 

 substance is dissolved the formula reduces to the simpler one, 



z^J"" (2) 



Arrhenius has further shown that the formula can be applied 

 to aqueous solutions of electrolytes and non-electrolytes up to 1.5 

 normal and 10 vol. per cent, solutions respectively, in which 

 the resulting error rarely exceeds one per cent. 



The correctness of the above results in the case of aqueous 

 solutions has since been confirmed by the works of Reyher,^^ 

 Wagner'^^ and others. 



1) Zeit, pliysik. Chem., 1887, I, 285. 



2) „ „ „ 1888, II,:744. 

 ?>) „ „ „ 1890, V, 40. 



