004 



Mr. L. Ve&ard : Contributions to 



These proportions Lave been represented in the adjacent 

 fig. 2, where four substances Sj, S 2 , S 3 , and S 4 are supposed 

 to be dissolved in the same solvent. The density curves will 



Fig-. 2. 



either rise always as OS-l or fall always as OS 4 . Only in the 

 case of such curves which are nearly horizontal may we 

 expect to find maximum points. 



Finally we shall make a comparison between solutions and 

 gases in this respect. If the absolute density is indicated 

 by a, we have in the case of gases 



J a, (lo a) 



~dh 



the 



gas constant 



KT 



for 



molecular mass M 1 / of 



where R is 

 the gas. 



In order to get a term for the solution that might be 

 compared with this, we must introduce another definition of 

 the concentration, and mean now by the concentration the 

 mass of the dissolved substances per volume unit of solution. 

 If the concentration defined in this way is indicated by C, 

 we get the equations of transformation 



'(,'-)= 



,~d<-) lac/ 



CV; 



B<- 



BO 

 B/< 



