DILUTION OF CONCENTRATED SOLUTIONS. 



329 



Table (III.) contains all the observations; the strongest solution is placed first in 

 the series. 



NOTE. In obtaining the specific heats of the solutions, a slight correction is made 

 for the change of specific heat with temperature. A later series of experiments were 

 performed in which the change was found for different concentrations. 



1000 



800 



09 



"a 



-2 



o 



_OJ 



"o 



s 



Is 



o 



c 

 o 



2. 20 





600 



HBtx 



/NaOH 



'HNO, 



:> 



7JO 



X 



^~ 5 i" i" 10 i" 



S 2 2 "O 



.5 



25 



30 



35 



Concentration :- -Molecules per 100 molecules of Welter. 

 Diagram II. 



Diagram II. includes the curve showing the relation between heat of dilution and 

 concentration for hydrogen chloride. 



(4) STUDY OF THE EESULTS OBTAINED. 



In the above table a column gives THOMSEN'S values and the results are calculated 

 out from the relation, 



^ = 17,340-12,000^ 



n N 



where Q is the heat generated per n gr. molecules of solute dissolved in N molecules 

 of solvent. 



The heat of dilution is given by 



5N 



2x2 



