BOILING-POINT MEASUREMENTS. 



149 



chloride, to prevent the moisture in the air from coming in contact with the 

 alcohol in the boiling-point apparatus. 



In the following tables m is the concentration in terms of gram-molecular 

 normal. This was obtained by dividing the number of grams of salt in 1,000 

 grams of the solvent, by the molecular weight of the salt. /> is the corrected 

 rise in the boiling-point of the solvent produced by the dissolved substance, 

 at the concentration in question, and -- is the molecular rise in the boiling- 

 point of the solvent at the given concentration. 



The results for lithium chloride, bromide, and nitrate are given in table 

 99. Calcium nitrate in methyl alcohol could not be satisfactorily studied, 

 on account of its limited solubility in this substance. 



TABLE 99. RESULTS WITH METHYL ALCOHOL. 



The constant for methyl alcohol is 0.84. By comparing with this value 

 the molecular rise found, we can see at once the magnitude of the discrep- 

 ancy between the value obtained experimentally and the theoretical value 

 for an undissociated substance. All three of the above salts are, of course, 

 dissociated to a greater or less extent by methyl alcohol. This, however, 

 would scarcely account for the magnitude of the molecular rise, even in the 

 most dilute solutions, since the dissociating power of methyl alcohol is only 

 from one-third to one-half that of water. Dissociation is entirely incapable 

 of accounting for the increase in the molecular rise with increase in the concen- 



