Vnitřní tření solných roztoků. 19 



Thereat is provided that 2îji/ 2 Na = i?Na. 



All these relations were correct for extremely diluted solutions, 

 where ail molécules may be regarded as perfectly dissociated. 



By the inner fiiction however one can't measure two dilute solu- 

 tions, for then the différences move in the faults of observation 

 Therefore I tried to get a greater dissociation beside the dilution by 

 increasing the température. 



According to that my experiments can be divided into the 

 following groups: 



1. the coefficient of the inner friction was measured at différent 

 concentration, 



2. at différent température and at the last 



3. the viscosity of the mixture of tvvo solutions, equally concen- 

 trated, was measured. 



Ail measurements were made by the known method of capillary 

 efflux. The coefficient was measured relatively, and the inner friction 

 of water at the same température was taken as the unit. Then the 

 absolute coefficient was calculated by the known coefficient of water. 



AU measurements, the préparation of the solutions and the 

 observing of constant température were made with the greatest careful- 

 ness, so that the faults of observation can be reckoned fewer than O2 /o- 



Of ail measurements I také these final results, on which the 

 additivity of the inner friction is to be seen. 



Tables IV., V., VI. 



Ail numbers in these tables are to be multiplied by 10" 5 . 



The scored values testify with certainly the additivity of inner 

 friction of the salts concerned. By these values at the same time is 

 to be seen that this physical quantity does not show by all salts and 

 concentrations so explicit an additivity as the other properties. In 

 order to get more précise results, further measurements on a greater 

 scale will be necessary, whereby perhaps also the regulär effect of the 

 anomalies at the obtained values will be declared. For, as the tables 

 show the values are falling at the 1 / 1 normal solutions, on line I. and 

 similary on line IL, on the contrary on line III. the values rise. Si- 

 milar anomalies, although not so regulär, are also to be found in more 

 diluted solutions. 



Values found by the second method présent themselves as the 

 result of faults in observation. 



-The last table (VIII.) contains the specific gravity of the con- 

 cerning solutions. 



The physical Laboratory of the Bohemian University of Prague. 



