14 HYDRATES IN AQUEOUS SOLUTION. 



CONCLUSIONS FROM THE EARLIER WORK. 



The results obtained in this investigation can all be explained satisfac- 

 torily by the suggestion put forward by Jones and Chambers. It should be 

 added that the boiling-point determinations, as far as they have any value, 

 point to the correctness of the suggestion that there are hydrates formed in 

 concentrated solutions. The boiling-point curves show a minimum corre- 

 sponding to the freezing-point curves. The minimum in the boiling-point 

 curves, however, is at greater concentration than in the freezing-point curves. 

 This is just what we should expect if the suggestion of the existence of 

 hydrates in such solutions was correct. At the higher temperature the 

 hydrates would be less stable, and would require greater concentration for 

 their formation than at the lower temperature. 



All things considered, then, the view that explains very satisfactorily 

 the results is that originally suggested by Jones, viz., that in the concen- 

 trated solutions there is combination between the molecules of the dissolved 

 substance and the molecules of the solvent, thus removing a part of the 

 solvent, as far as freezing-point lowering is concerned. 



To explain the conductivity result it is also necessary to assume that 

 there is a certain amount of electrolytic dissociation, together with hyd ra- 

 tion, existing in these solutions. 



