Vol. e ap 4.] Silver Dioxide and Silver Perorynitrate. 149 
N.S. 
surrounded by ice and water, and the electrodes were rectangular 
i 4cm. x 2cm. the kathode being surrounded 
by a porous cell. In Expt. I, the current was continued for two 
cases the anodic product easi ted from the platinum foil, 
y decantation and dried 
iccato 
difficult to avoid loss when the sudden gas-evolution occ ‘ 
The black residue was, after weighing, transferred as completely 
as possible to a porcelain crucible and gently heated until it 
turned completely white, 7.c., was reduced ee HE to metallic 
silver. 
Sample I.—0,3133 gms. gave 0°2861, gms. residue after gentle 
ignition, and 0°2499 gms. silver. 
Sample IT.—0°4772 gms. gave 0°4368 gms. residue after gentle 
ignition, and 0°3801 gms. silver. . 
Sample III.—0°4365 gave 0°3989 gms. residue after gentle 
ignition and 0°347 aa silver. 
gave 04507 gms. residue after 
gentle ignition, and 0°3931 . silver. 
(b) 0 gms, gave 0° gms, residue after gentle igni- 
tion, and 0°3497 gms. silver. 
6 Percenta | urrent || , 
% strength of | Pasar density | residueafter | Per cent. 
me N a ampéres per igni silver 
s solution. em. 
] 
I 15 003 | 0015 91°35 79.78 
It 15 O55 =| 007 91.54 79 66 
Ill 15 1:12 0-14 91.40 79.68 
IV ae O56 | 0:07 (a) 91.70 79.98 
(b) 91.88 80.18 
Ag NOy requires 91.56 79.91 
oc 
into needle-like aggregates. It therefore appears that the product 
is not a mixture but a definite chemical compound, 
