la 
At the beginning of the analysis, where ( is great, ~ is, there- 
a, 
fore, smaller than at the end, where C, has descended to a small 
value. If we eall this initial and this final value (C}, and (,, the 
ee mie 
mean value of ; during the analysis is: 
Os 
Gi 
er EVE 
Da, J dt, 
Pe EGS 
d, 1b 
d, Ik Cis ] 
or 
d D. L 1 
a pe - (2) 
d, D, n° Culte 
Al . . 1 . ke, 
For a given value of Cy, and C\, the value of is now deter- 
a; 
mined by 7. 
d 
If we assume 7 — 0.5, Ci, = 0.01, Cy, = 0.00004, then ~ = 10 3. 
C 
1 
As a quantity of silver of the anode dissolves which is about 
three times the value of the deficit of chlorine, the diminution of 
weight of the anode is found 0,4 > 10-? too small. Moreover the 
concentration of the chlorine ions in the solution remains 0.00004 
at the end of the determination, hence 0.4°/, of the original quan- 
tity. Hence with this mode of working the total error is 0.8 °/,. 
If n is taken greater, e. g. —1, and C, — 0.00002, the shortage 
of AgCl on the anode becomes 0.2 °/,, 0.2°/, of the chloride remain- 
ing in solution, so that the total error amounts here to 0.4 °/,. 
With the given value of (\, a smaller error cannot be reached. 
This would only be possible by making C, greater, but this requires 
a very large silver surface. Nor is the above given value for” = 1 
practically to be realized, as in this case the current density would 
become = 0. 
In general the current density becomes greater, hence the time 
required for the execution of the analysis shorter, as 7 is smaller. 
The accuracy of the analysis, is however diminished by this. 
The duration of the analysis can be calculated in the following way. 
When we work with a current density smaller than the critical, 
