SYSTEM NAPHTHALENE-CHLOEOBENZENE-PHENOL, ETC. 



1.0° 



Fia:. 4. 



C. The Heat Capacity of the Solutions. 



Ill the case of dilute solutions the quantity of crystals which 

 separates out is negligible in the determination of the concentra- 

 tion, but in concentrated solutions this must be taken into ac- 

 count. For this purpose it is necessary to know the heat capacity 

 of the solution, the vessels, etc., and the degree of supercooling. 

 Before proceeding to the observation of the fusion points, the 

 heat capacity was determined in the following manner. Electric 

 energy was converted into heat, and the rise of temperature was 

 read, from which the specific heat could be calculated by the 

 equation, 



i? X -^ X 0.238 



Specific heat = — ^-r-i — tt-h — ^ — i 1 -■ > 



^ weight 01 liquid x temperature increase 



where 



R = the resistance of the manganine wire for heating the 

 liquid, 



