18 V. Viktor Teissler: 



The inner Friction in Salt Solutions. 



By Viktor Teissler. 



In the présent páper I resolved to examine, in what way the inner 

 friction of sait solutions is an additive property. While most of the physi- 

 cal properties of hydrous sait solutions must be regarded as additive, tili 

 now one can't say the same about the viscosity . Although many experiments 

 hâve been made on this subject, no exact laws hawe been formulated. 



In order to examine this additivity I made use of the ordinary 

 method : If the inner friction of the solution is said to be an additive 

 one then, it must be regarded as the sum of the frictions: 



1. of the solvent, 



2. of the anion and 



3. of the kation. 



For my experiment I chose simple salts as NaCl, KCl, LiCl. 

 There the coefficient of the friction at the same degree of dissociation 



OUgllt tO COnSist Of '>?NaCl-f a q = >?Na + fCl + ?]aq 



the coefficient of the inner friction of water and of a part of natrium 

 and chlor. Likewise for the same concentration of the solution of KCl 

 the relation î? KC i + aq = rj K -\- q ci -f- iy aq 



may be stated, so that after subtraction of both the value for i? Na — rj K 

 is to be found. Equal relations consist of another pair of solutions 

 with the same metals but other acids, for example NaBr and KBr. 

 In that case ought to be 



i^Na — ?/k of the chloride = 17 Na — r /K of the bromide. 



By a similar combination the metal may be eliminated and in the 

 resuit only the influence of the employed acids rjci — ^Br would be seen. 



To settle in what way the formulated relations are valid, was 

 the object of the expérimental test. 



For the shortness of the expression of my results I made use 

 of the following annotations: »;N a oi + a q , «?kci+ aq these are the coefficients 

 of the inner friction of the solution of NaCl resp. KCl by a fixed 

 concentration (normal solution) and J7i/ 2 Naci+ aq means the inner friction 

 of a half concentrated solution. In the same way i?i/,Naci + v 2 kci + aq is 

 the inner friction of the mixture of two equal concentrated solutions 

 of NaCl and KCl. 



Then in the case of additivity the following formulae must hold 



í?l/ 2 NaCl + l/^KCl + a q = î?aq + ^l/ 2 Va + ^l/ 2 K + VC\ and 

 »/SaCl+af) = *7aq -\~ »/Na-j-^Cl, whei'e îJi/2 (NaCl + KCl) + aq and 1?NaCl + aq 



are experimentally given. By subtraction one will find 



î? l/ 2 NaC( -f 1/ S KC1 -f- aq V NaCl + aq = V%^ V 1 ^*' 



