669 
Fig. 3. 
density 8 becomes almost 0, i.e. practically all the silver chloride 
is deposited in the liquid. 
The point of inflection A in the line gives the limit between 
current densities, at which the AgCl is mostly deposited on the 
anode, and those at which the AgCl for the greater part deposits 
in the liquid. The density of the current in A may be called the 
critical current density, the value of 3 is here */,. Hence we find 
from (42) for the critical current density: 
BRE oe 
CT [D‚CD,C} a ee ee (#3) 
If this equation is written in the form: 
1.117 a Ë 
ax, = Se Ee De | re a ee 
we may write, when C, is great compared with VL: 
| at BLY 
di == ip BO 
In this case the critical current density is therefore proportional 
to the concentration of the chlorine ions, and it is given by the 
same equation as the cathodic limiting current for simple salts. 
