SYSTEM NAPHTHALEXE-CHLOROBENZENE-PHEXOL, ETC. 33 



special form assumed by the fusion surface, we must have more 

 detailed knowledge about the association of phenol. 



Notliing certain is as yet known about the polymerisation 

 of phenol in solution. Xerxst has concluded from the study 

 of the partition coefficient, tliat phenol dissolved in benzene is 

 associated to double molecule. ^^ But it can not be ascertained 

 whether all of the phenol is associated to such a degree, since 

 ill the more dilute sohUions it must l)e considered to be dis- 

 sociated to a great extent."' On the other hand Yamamoto'"' has 

 concluded from his study on the fusion curve of naphthalene 

 and phenol, which has also been confirmed in the course of the 

 present investigation, that phenol must be considered to contain 

 more complex molecules, at least (CgHuO)^. It is plain that the 

 degree of association depends upon the concentration, as well as 

 on the temperature. The following two equations may be as- 

 sumed to represent these relations : 



^^~ R\x T r 



Where 



c-i = the molar fraction of the simple molecule CeHoO, 



Cn = the molar fraction of (CgHgO)^, 



D = the heat of dissociation, 



% — the temperature at which In ^ vanishes, 



T = the temperature under consideration. 



1) Zeit. phys. Cliem., 8, p. 116, (1891). 



2) Beckmann: Zeit, piiys. Chein., 2, 715, (1888). 

 AvwEKS: Zeit. phys. Chem., 18, 599, (1895). 



?>) Loc. cit. 



