1380 
lead acetate, which is normal with respect to the two components 
together. D = 2.56 
°/, lead acetate <A 
0 1.78 
2.0 1.55 
4.0 1.20 
12.5 0.538 
33.0 0.12. 
With a higher lead content the weight of the cathode increases 
in consequence of lead then depositing on the cathode. Then there 
will therefore be a solution with a content of lead acetate slightly 
above 33°/,, where for D— 2.56 the weight of the cathode does 
not decrease nor increase. In these cases the solution becomes black 
through seattered lead, which here does not originate, or not exclu- 
sively from lead of the cathode, but from lead which is as ion in 
the solution. This is discharged at the cathode, at which also sodium 
is deposited. The formed alloy, however, scatters immediately, so 
that the result of the electrolysis is: no change of weight of the 
cathode, formation of a certain quantity of finely divided lead in 
the liquid and generation of hydrogen. 
6. Lead scattering in diluted sulphuric acid. 
Also in diluted sulphuric acid lead scatters in case of cathodic 
polarisation. The quantity that seatters is of the same order of mag- 
nitude as in solutions of sodium and potassium salts. For the rest 
the scattering in sulphuric acid is distinguished from that in solutions 
of Na and K-salts in this that for acid solutions the influence of the 
concentration of the solution and of the duration of the electrolysis 
are much greater. Besides the scattering only takes place for com- 
paratively large current densities. 
The determinations are much less easily reproducible here than 
in solutions of K and Na-salts. The following tables illustrate what 
has been said. : 
H,SO,=O.1 n. f= 15°. 
Current density. 
Duration of the | 
electrolysis 0.16 | 0.32 0.64 | 2.56 
| | 
10 sec. 0 | 1.5 1.8 So: 
30 sec. 0 1.4 07 ad 
90 sec. 0 0.6 0.8 | 1.4 
