N-PROPYL ALCOHOL. 



103 



TABLE 82. ETHYL ALCOHOL Continued. 



N-PROPYL ALCOHOL. 



Propyl alcohol gives lowerings of the freezing-point that differ markedly 

 from those produced by methyl and ethyl alcohols. The molecular lowering 

 increases with the concentration up to a certain point, passes through a 

 maximum, and then decreases (table 83). The corrected molecular lowering 

 is smaller than the theoretical value, 1.86, at nearly all concentrations, and 

 becomes very much smaller in the more concentrated solutions. Indeed, in 

 a six-normal solution the corrected molecular lowering becomes less than 

 half of the theoretical value. This is shown under " Hydrates," in table 83. 

 The explanation of these results is to be found, undoubtedly, in the poly- 

 merization of the molecules of normal propyl alcohol, especially in concen- 

 trated solution. It is therefore impossible to say in such cases whether or 

 not there is any hydration. 



TABLE 83. N-PROPYL ALCOHOL. 



