Laivs of Molecular Force. 



291 



expressing the linear relation between conductivity or sum of 

 ionic velocities and u — q. 



Table XXXIX. 





u. 



Q- 



u— q. 



h. 



k (calc.). 



KI 



535 



44 



36 



41 



32 



24 



20-5 



20 



22 



24 



24 



23 



35-3 



25 



18-8 



32 



21-7 



15-5 



14-5 



14 



16 



175 



18-6 



15-8 



18 

 19 

 17 



9 

 10 



8-5 



6 



6 



6 



6-5 



5-4 



7 



107 

 107 

 105 



87 

 87 

 87 

 78 

 80 

 81 

 83 

 86 

 77 



108 

 110 

 105 



88 

 90 

 87 

 81 

 81 

 81 

 82 

 80 

 83 



KBr 



KC1 



Nal 



NaBr 



NaCl 



LiCl 



AMgOL 



iOa01 2 



|SrCl 2 



-|BaCl 



AZnCl 2 





The agreement is here such as to prove a true connexion 

 between conductivity and u — q, the more striking as no relation 

 can be seen between conductivity and u or q taken separately. 

 The only bodies I have omitted from Kohlrausch's latter list 

 are the nitrates of some of the above metals and of silver, the 

 hydrogen compounds of the halogens, and the ammonium 

 compounds. These do not give results in harmony with 

 those in the last table, and, indeed, we should hardly expect a 

 compound radical like N0 3 to experience frictional resistance 

 in the same manner as a single atom like CI, and as to the 

 hydrogen compounds they form a class by themselves with 

 respect to many physical properties. It will be as well to 

 show the amount of departure in these cases in the following- 

 Table :— 





u. 



2- 



u—q. 



k. 



k (calc). 



HI 



56 



50 



42 



47 



36 



475 



35-5 



26 



16 



11 



22 



19 



255 



22-2 



30 

 34 

 31 

 25 

 17 

 22 

 13 



327 

 327 

 324 



98 



82 



98 



104 



134 

 142 

 136 

 123 

 L05 

 116 

 97 



HBr 



HC1 



KN0 3 



NaN0 3 



NH 4 N0 3 



NH t Cl 





Kohlrausch has pointed out that there is some difficulty in 

 determining the true connexion between ionic velocities and 

 conductivities in the case of the bibasic acids S0 4 and C0 3 , so 

 that we must leave them out of the count for the present. 





