DILUTION OF CONCENTEATED SOLUTIONS. 

 The following values of heat of dilution were obtained for hydrochloric acid : 



343 



In both cases, therefore, the heat of dilution rises with temperature, and the mean 

 coefficient of increase with temperature is greater for the concentrated solution than 

 for the dilute one, between the extreme ranges of temperature. 



Lithium Chloride. 



The specific heats of a solution of lithium chloride were found in the same manner 

 as those of hydrogen chloride. It is possible, however, to employ higher temperatures 

 than in the above case. On the other hand, the strongest solutions coidd not be used 

 at the low temperatures owing to the solution becoming saturated. 



At the highest temperatures radiation becomes far more prominent, and larger 

 heating currents were employed. The solutions were heated for 1000 seconds. 



The following table gives the specific heats of a solution of lithium chloride 

 (concentration 18 '8) at various temperatures : 



The specific heat increases rapidly with temperature, the relation between them 

 being nearly a linear one. Heats of dilution for a solution of concentration 14 '2 

 molecule per 100 molecules are here quoted. 



VOL. CCXV. A. 



2 z 



