CC de Ke, . . . ° . . . : . (4) 
and 
et. == Ro, SPE, Pat quel’ danas oe: Bel mas WE 
When the solution is saturate with respeet to Ag,(CN),, (5) passes 
into: . 
B re Ve ve PARE REE 
where £ is the product of solubility of silvercyanide. 
Now a precipitate will be formed on the anode, as soon as 
Canin has become L, and the electrolysis will have to be conducted 
so that Cog¢iq remains < LL. iq, Coq ete. denotes the concentration 
close to the anode, C,, C, ete. denoting the concentration at the 
boundary plane of the diffusion layer with the rest of the liquid. 
According to § 2 of the preceding paper, the quantity of cyanogen 
ions diffusing per second towards the anode, is equal to: 
DD; C3 — C30 
86400 db 
So long as no Ag,(CN), is precipitated, these will form ions 
Ag(CN), which move away from the anode through diffusion. The 
quantity of this is given by: 
ee en an 
BEANO ved 
From which follows that: 
BDE PO Oe TA cr na hate AB) 
The current density is: 
G11 ale a AEL AN AM) 
This current density is therefore maintained through the cyanogen 
ions diffusing to the anode, and ions of Ag (UN), being formed 
there, which diffuse away from the anode. If the current density 
is increased, it will attain a value at which not enough ON diffuses 
to the anode for Ag(CN), to be exclusively formed; dlso Ag,(CN,) 
will then have to be formed at the anode. When the current density 
is regulated so that the solution at the anode is just saturate with 
Ag,(CN,), but no appreciable quantity of Ag,(CN,) is deposited, the 
equations (6) and (7) hold, and at the same time: . 
ara dn SON eR adh aoe ta eed 
and 
Chis. ogy ae A Pa dh oe) ae . (4) 
From (4), (5a), and (6) follows: 
