DISOXIDATION EFFECTED BY THE ALKALINE PEEOXIDES. 
843 
and putting m=tlie parts of the solution of peroxide of hydrogen, and parts 
of the solution of feriicyanide respectively decomposed, 
and if ^=the ratio of the oxygen evolved from the peroxide of hydrogen to the oxygen 
evolved from the solution of ferricyanide, then 
ms 
The value of ms is thus given : — 
Putting ?z= the parts of the solution of peroxide of hydrogen employed in the experi- 
ment, and p=the parts of the solution of permanganate required after the termination 
of the reaction, 
= ?^s — -f- , 
whence 
x=l 
ns—p 
TWjSl 
In the second of the following experiments the ferricyanide was taken in excess. The 
experiment was conducted as before, with the exception that the solution of peroxide of 
hydrogen, having been rendered nearly neutral, was dropped from the pipette into the 
solution of ferricyanide. The whole of the peroxide is decomposed, in which case 
and 
n=m, 
ms 
p' 
I. s=l'06, 
?i=10, mi=10, _^=:10-6, 
.3?=1’0000. 
TI. s=0-76, j>=7-6, 
n=m=10, 
a;=l- 0000 . 
I have varied the form of these experiments in many ways Avithout producing any 
variation, in the resulting value of x. 
The final result of this decomposition is given in the equation 
2 (K 3 Fe 2 Cy 6 )+Ba 2 02 = 2 (K 3 Ba Fe 2 Cy 6 )+ 02 . 
3. Decomj^osition of a Solution of Peroxide of Hydrogen ly Hypochlorite of Barium. 
When peroxide of barium is mixed with a solution of an alkaline hypochlorite, oxygen 
gas is evolved, and both substances are decomposed. 
The following experiments were made with the hypochlorite of barium. It was pre- 
pared by leading chlorine through a solution of hydrate of barium to complete saturation, 
the excess of chlorine being afterwards expelled by a current of air. 
The amount of hypochlorite of barium present in the solution was estimated by 
decomposing the solution Avith hydriodic acid, according to the method of Bunsen. 
