659 
whereas there vanish by diffusion : 
D, ¢x,—C, 
86400", ? 
when the index 2 refers to the particles of the complex former. 
From this follows : 
pls (GC, — ty.) == Dy (ek) tn ee Sy 
This combined with (11), yields: 
(13) 
pdd 
See Ve 
On substitution of these values in (10) the equation of the current 
potential line becomes : 
0.058 0.058 Id 
E=e — —— "log K + sed log G “4 É ) | 
n n 
LD: 
At LO 
Pp pdd 
— 0.058 — log RT . 
n ; LUD. 
(15) 
Poke = 
The course of this line depends in the same way on the concen- 
tration of the complex ions, as for simple salts on the concentration 
0.058? log K 
eee oe 
n 
of the elementary ions. The term — auses the potentials 
to be more negative than for simple salts, AK always having a very 
great value for the complex ions considered here. The above consi- 
derations do not apply to ions of slight complexity, as for this we 
should not only have to take the diffusion of the complex ions into 
account, but also the diffusion of the elementary ions present. 
Accordingly the value of A bas only influence on the situation 
of the line, not on the form. 
The last term of (16) has the greatest influence on the form of 
the line. It causes the line to run very flat in the beginning. The — 
slope of the current potential line for small current densities is given by : 
Ee esin ef 0.025 pd 
d=0 
<a mn a 17 
Ad Wig eg rok pu TDi.” 4) 
AE 
Hence the value of aa will be much greater than for simple salts, 
\d 
2 
especially for small value of C,. The factor 0,025 P’ causes the line 
n 
to run the flatter as the number of molecules bound by the ion, is 
greater. In general the line will, therefore, run flatter for bivalent 
ions than for univalent ones, because Ee hence the number of mole- 
n 
42% 
