12 



HYDRATES IN AQUEOUS SOLUTION. 



Owing to limited solubility the study of the sulphates at great concentra- 

 tion was not possible, so that it can not be stated whether or not these salts 

 exhibit the phenomenon. 



In general, we may say that the freezing-point curve for any acid lies above 

 those of the salts which it forms with the metals of the first group, while it 

 lies below the curves for its second group salts. The molecular conductivities 

 are plotted in curves, figs. 7 to 10. The ordinates are molecular conduc- 

 tivities, and the abscissae volume of the solution, or the number of liters 

 that contain a gram-molecular weight of the electrolyte. 



The conductivity curves for all of the substances studied are perfectly 

 normal throughout, showing absolutely no peculiarities in the region of 

 dilution where the minimum of molecular depression manifests itself. 



v 10 



Volume 

 FIG. 10. 



is 



03 0.5 



771 Z 



Concentration 

 FIG. 11. 



