a 
Vol. II, No. 4.) Silver Diowide and Silver Peroxynitrate, 147 
[N.8.] 
of Sale and of my own work, leave no doubt that the substance 
ust be a ie as AgNOn « and not by the more oad ng 
evolution of oxygen. This reaction occurs more readily on boiling, 
and is complete in less than an hour, Oxygen is pied 
ac 
which I have examined carefully and which Se pure silver dioxide 
Ag,0, probably obtained pure for the first time. The course of 
the reaction is represented by the Giiation = 
Ag, NO), = AgNO, + 3Ag,0, + O;. 
The dioxide of silver—The insoluble substance which remains 
after long boiling with water of the peroxynitrate is undoubtedly 
pure silver dioxide, Ag,O,. This is shown by— 
p eeeubeae of silver which it contains ; 
(2) the fact that on heating, oxygen only is evolved and that 
in amount re pee by the dioxide, Ag,O,, and pene remains 
behind pure silve 
(3) the fact “that on treatment with warm dilute sulphuri 
acid, the substance dissolves with the evolution ot: iii amount of 
oxygen required by the equation— 
It is bay greyish- black me of Sp. G, 7°44 ore. which Drag / 
hea f 100° C without ae Ata ~ temperature 
vitae Eat and leaves si 
The behaviour of the dioxide with a 
It dissolves in this reagent with the een of se ‘ba 5 ie 
amount required by the equation— 
6Ag,0, + 2NH, = N, + 3H,O + 3Ag,0; 
and not, as would have been expected, in accordance with the 
equation— 
3Ag,0, + 2NH, = N; + 3H,O0 + 3Ag,0. 
It would be desirable ta seen city the nature of the product 
m 
these co colors are due to the feeiiaticki of silver per-salts, There 
seems no doubt that the same salts are formed from the peroxy- 
nitrate as from the dioxide, as the airs and absorption spectra 
of the solutions obtained from the two substances are identical. 
