584 



^ 3. The Tempe^^aiure-coe/jicients of the Specific Surface-energy 



In connection witli what was said in the foregoing communication 



about the calcukition of /j at any arbitrary temperature t, lying 



above the meltingpoint tg of tlie salt investigated, we only need to 



resume here the corresponding values of tg, a, ^, and c, for each salt: 



In connection with the general rules, given in § 7 of the foregoing 

 communication, we can make the following remarks with respect 

 to the data given above. 



Although in these cases also, the value of /« at the same tempe- 

 rature t appears gradually to decrease with increasing atomic weights 

 of the alcali-metals, whose corresponding salts are investigated, we 

 see that in the series of the nitrates, the lithiumsalt represents an 

 exception to this rule, because its x-^curve lies under that of the 

 sodiumnitrate. It is of interest, that just in this series of the alcali- 

 nitrates also other deviations of the normal arrangement are found : 

 so with respect to the solubilities and the meltingpoints. About the 

 relative or absolute values of the temperature-coefticient b, nothing 

 of general application can be put to the fore : evidently no simple 

 relations will be found here, where the structure of the salts is already 

 more complicated than in the case of the halogenides of the alcali-metals. 



, Lab. for Inorg. and Plujsical 



Groninqen, August 1914. ,,, . , /• w tt • " -^ 



•' ° Chemistry of the University. 



