SYSTE]\I NAPÎTTHALENE-CHLOROBENZENE-PHENOL, ETC. 17 



Q is the value calculated from the equation, 



where Tq= the absolute fusion j^oint of pure naphthalene, 



T — the absolute fusion point of the solution, 

 (4650) is the value experimentally obtained by Alluard.'^ 



The values of Q in No. 2 and No. 3 are not reliable, 

 because {T^—T) and hiC^^ have too small values and an error 

 may effect even the second figure of Q. 



At any rate the values decrease regularly with a decreasing 

 temperature, or with an increasing concentration of chlorobenzene. 

 This is doubtless due to the inequality of the specific heats of 

 liquid and solid naphthalene. But it may also be due to the 

 insuÖicient fulfillment of the conditions of the ideal solution by 

 naphthalene and chlorobenzene. This point will be discussed 

 further on. 



TABLE 2. 



Fusion Curve No. 1. 

 Naphthalene-phenol. Solid phase : naphthalene. 



No. t p Jt X n P N X 



1 79.87° 0.000 _ _ _ _ _ 1.0000 



2 72.87° 1.355 0.81 0.18 9.90 .01441 .07734 0.8433 

 G7.98° 2.807 1.16 0.29 9.79 .02986 .07648 0.7190 



4 63.58° 4.684 0.G8 0.20 9.88 .04983 .07719 0.6083 



5 59.11° 7.010 1.35 0.45 9.63 .07458 .07523 0.5002 

 G 54.64° 9.708 0..33 0.13 9.95 .1033 .07773 0.4294 



1) Anil, de chim. et de pliys. (.">), 57, 471, (1859). 



