53 



are based on the value of H taken as zero. That is if the 

 vahie of H is added to that of OH, we will have the decom- 

 position value of HoO 1.68. These values are for molar con- 

 centrations. 



Ag = — 0.78 1=0.52 



Cu = — 0.5 Br = 0.94 



H = -f 0.0 = 1.08 (In acids) 



Pb = + 0.17 Cl=1.31 



Cd = + 0.38 OH=1.08 (In acids) 



Zn= + 0.74 OH = 0.88 (In base) 



The table is applied to the quantitative determination of CI, 

 Br, and I, in solutions. 



The minimum E. M. F. of decomposition of this system for 

 a solution of Ag and separation H, is given by the following 

 equation : 



71 = 0.5075 log-, -f; — C.0575 logr. ^ 



at 17", when Pi and Po are the electrolytic solution pressures 

 of the Ag and H, p^ and p^ being the osmotic pressures of 

 the ions Ag and H. 



