KINETICS OF CERTAIN SILVER SALTS 291 



have an exceptionally great velocity, can be added to this 



series. 1 



OH H 



I. 187 350 X 10-' 



III. 159 137 X 10- 4 



A result of this regularity would be that, as the tempera- 

 ture rises, the rates of transference would all approach the 

 value 0.5, and the conducting powers Xoo of all salts would 

 approach equality. 2 



If we attempt to calculate the velocity of the silver ion 

 from [121] the salts of the two dibasic acids which we have 

 studied, we obtain from 



Ag 2 S 2 O 6 : 1540 X 0-394 = 0-607 

 Ag 2 SiP 6 : 1120 X 0'534 = 0'598 



These values are somewhat greater than those found be- 

 fore. To avoid a conflict with the necessary assumption that 

 the free ion of silver must have the same velocity, no matter 

 whether it has been liberated from a mono- or dibasic acid 

 ion, we must admit that the rates of transfer in these two 

 salts, which were measured at a concentration 0.025 and 0.028 

 respectively, must change on further dilution. As our inves- 

 tigation was brought to a close by the departure of one of us 

 from Leipzig, we were unable to set this question at rest; we 

 note in passing, however, that the dissociation hypothesis 

 makes it probable that the compounds of multivalent radicals 

 are still undergoing changes at dilutions in which mono- 

 basic compounds show a constant rate of transference. The 

 dissociation products for Ag 2 S 2 O 6 , for instance, are Ag, 

 AgS 2 O 6 and S 2 O 6 ; consequently in such dilutions as 0.025 

 there may exist, besides the ions +Ag, +Ag, -S 2 O 6 , upon 

 which we based our calculations, a considerable set of ions 

 +Ag, -AgS 2 O 6 ; if these decompose on further dilution, the 



1 Nernst, Zeitschr. 2, 626. 2 Compare Arrhenius, loc. cit., p. 45. 



