ON THE HALOGEN HYDRIDES AS CONDUCTING SOLVENTS. 



135 



VAN 'T HOFF has shown that the molecular rise of boiling-point can be calculated 

 by means of the formula 



, T _ 0-02T 2 

 ~W~' 



where T is the absolute temperature and W is the latent heat of evaporation of 

 1 gramme of the solvent. 



We have calculated the values for the molecular rise of boiling-point of the various 

 solvents by means of the latent heats which are given in Part I. 



The molecular weight of the dissolved substance has been calculated from the values 

 so obtained for the molecular rise. 



The molecular weights are given under M' in the sixth column of the tables, and in 

 the fifth column the concentrations of the solutions are expressed in grammes of solute 

 dissolved in 100 grammes of solvent. 



0-09T 2 

 TABLE V. Molecular Weights in Hydrogen Chloride, IT = 720. 



