380 





Mr. A. 



Frumkin cm t/i£ 

 Table I. 









KN0 3 . 



< = 15°(fig. 2). 





y- 





n-i/ion 



1/10 » -1/100 n. 



1/100 n- 1/1000 11. 



99-0 







0-045 



0049 



98-0 





0-037 



0-051 





95-0 





0-021 



0052 





900 





0022 



0-048 





85-0 





0025 



0-051 





80-0 





0035 



0-052 





75-0 





0035 







ET n a, 



-. ^^le — 



£i 



0-051 



0-054 



0056 



F g «. 2 c 2 





Ba(N0 3 ) 2 . * = 15°. 





y- 



1/10 m- 1/100 ». 1/10C 



»- 1/1000 »: 





99-0 





0020 



0032 





98-0 





0020 



0-027 





97-0 





0-023 



0029 





950 





0-026 







90-0 





0022 







86-0 





0-025 





E 



-ig-^. 



7 «2 C 2 







028 



2] 







We see thus that the observed values of ^ — ^i are in a 

 satisfactory agreement with the calculated ones, except for 

 normal solutions. At higher concentrations the term T A 

 may be of importance, or perhaps in this case Gibbs's 

 equation is no longer valid. 



Let us now consider a zinc amalgam, immersed in a solution 

 of zinc sulphate. Here 



whence 

 and 



f 1 UT ^ 



Y — const. ,=- log c, 



' nr 



Y h — =^ log c = const., 



7 = const., 



i. e. the surface-tension of the amalgam does not vary with 

 the concentration of the solution, a result which we have 

 already obtained in a different way. 



