Vol. iN sy 4.| Silver Diowide and Silver Perowynitrate, 145 
was a mixture and in conjunction with the uniform crystalline 
Silver peroxynitrate, when heated to a temperature of about 
150°, suddenly evolves oxygen, and there is left about 91°5 per cent. 
of a black residue. Sale has investigated this reaction carefully 
and has shown that it may be satisfactorily represented by the 
equation— 
On the further application of heat, a certain amount of brown 
fumes are evolved and there is left pure white silver 
2AgNO, = 2Ag + 2NO, + 9, 
6Ag,0 = 12Ag + 30, 
This behaviour, when heated, is of importance when consider- 
ing the structural formula to be assigned to the compound. It 
shows that in some way one atom of silver is differentiated from 
the other six. This is shown both in the formula suggested by 
o 
Sale, viz.— : 
(a) AgNO,. 3Ag,0;,0; 
and in that ascribed to the compound by Mulder and Haringa, 
Z— 
(b) AgNO,, 34g,0, 
To both of these formule, however, there seem considerable 
objections. 
That of Silc rests also on the behaviour of the substance when 
treated with aqueous ammonia (Z. Anorg. Chem., 24, 305), in which 
reagent it goes into solution with the evolution of nitrogen, but 
both the analytical data and the argument based thereon seem 
open to objection. He supposes that it is only the Ag, 0, part of 
