138 
to account for all the important circumstances, we shall have to 
occupy ourselves with the three equilibria (15) (16) and (17). 
If we eg. suppose that the metal is immersed in pure water, 
and chlorine is added, the metal will be dissolved in consequence 
of the removal of electrons on account of the small electron con- 
centration of the equilibrium: 
ee 1 
26 + Cl, S2 Cl 
Now equation (17) expresses that a second consequence of this 
removal of the electrons is an increase of the concentration 
MAER 
ratio ES 
Mi 
6. The equations for the potential difference metal-electrolyte. 
For the case supposed here we get for the potential difference 
metal-electrolyte the equations 
RT Kur (Mg) 
-ln ———_——_ . 
A= — — (21) 
Oe en ED 
RT. K'y»(Mg 
fee eee (22) 
vy Ff (M77) 
and the electron-equation : 
RT “KG (Gs 
A teens MORE tye Saale ae 
B (Or) 
From (21) and (22) now follows: 
y lly = Yo. My, 
K'y(Ms)]°* K'y(Ms) |" 
Kens LEE Ere NBE 
(M7) 
or 
„a Vi Y Yn a 
Kn (MS i _ (Mr) (25) 
mi va 4 . va. 7 . . . . _ 
KL) 
We shall now assume that A‘) is very great compared with 
K'\’» or in other words that the ions J/* are very much baser 
than MM”. 
In this ease the fraction 
BET 
— is very great, and much greater 
ME Kl, 
than - Ee > 
(US$) K 
- being so exceptionally great. 
idl 
My. 
