AT THE MOMENT OF CHEMICAL CHANGE. 
795 
Table VIIL— C. 
Oxygen in the 
peroxide of 
barium 0 = a. 
Oxygen of the 
oxide of silver 
reduced =■</'. 
Ratio, a : i/-. 
Calculated ratio. 
1. 
2. 
100 
71- 39 
72- 78 
7:5 
71-42 
These experiments, although made with but small quantities of the oxide, give a 
loss as great as any made with the other preparation. 
Two experiments with the peroxide Q, at the same temperature, gave a yet greater 
loss. 
7’able IX. — A. 
Peroxide of 
barium Q. 
Oxide of silver. 
Chloride of silver 
found. 
Equivalent of 
oxygen. 
1. 
2-985 gnns. 
7-878 grms. 
3-843 grms. 
0-2142 grm. 
2. 
2-9544 
7-9215 
3-801 
0-2119 
Table IX. — B. 
Oxygen in the 
Oxygen of the 
peroxide of 
oxide of silver 
Ratio, a : ■4>. 
Calculated ratio. 
barium Q=a. 
reduced = 
1. 
2. 
8-58 
7-17 
7-17 
6:5 
7-15 
Table IX. — C. 
Oxygen in the 
peroxide of 
barium Q=a. 
Oxygen of the 
oxide of silver 
reduced = 
Ratio, a : ■4'. 
Calculated ratio. 
1. 
2. 
100 
83-56 
83-56 
6 : 5 
83-33 
This is the greatest amount of loss which I have yet obtained in these experiments 
with silver compounds, which has never quite equaled the oxygen in the peroxide. 
The specific difference in the amount of reduction of the chloride and of the oxide 
of silver under otherwise similar circumstances with the same preparation of the 
peroxide, that is, at the same temperature, depends doubtless on the difference in the 
chemical nature of the substances. It was an interesting matter of inquiry whether 
this difference would be found with other silver compounds : I have not yet extended 
my experiments in this direction so far as the importance of the question demands, 
but the following results show both the identity and the difference which may exist 
in the reaction. 
The following experiments were made at 100°C. with carbonate of silver and with 
5 I 2 
