856 
PEOFESSOE B. C. BEODIE ON THE OXIDATION AND 
hydrogen is a cause adequate to produce the etFects of catalysis, is evident from the fol- 
lowing examples. 
I. We can successively realize the chemical changes of Avhich the result, as regards 
weight, is expressed by the equations 
MnCl+KHO=KCl+MnHO, 
H2 02+2MnH0=H2 0-{-Mn2 Hg O3, 
H2 02+Mn2H2 03+2 HC 1 = 3 H 2 0+2 MnCl+Oa- 
The final result which ensues from the successive performance of these experiments is 
expressed in the following equation, derived by elimination from the preceding, 
2 KHO + 2 HCl + 2 H2 O2 = 4 H2 O + 2 KCl + O2 ; 
which equation is again equivalent to the two equations, 
KH0+HC1=H2 0+KCl 
and the equation expressive of the catalytic decomposition of the peroxide of hydi'ogen, 
viz. 
2H2 02=2H2 0+02. 
II. Again, omitting for the sake of brevity certain circumstances in the reactions, we 
can produce the results expressed by the equations 
3II2 O2+C14 03=31+ 0 + 201-2 O3, 
201-2 O 3 + 3 H 2 O2=0r,O3+3H2O + 3O2, 
whence, by elimination, 
21+ 02=2H2 0+02. 
2Na4 Fe2 Oy6+Na2 02=2Na2 0+2Na3 ^62 Cy ^, 
2 Na, Fe2 Oye+Na2 02=2 Na^ Fe2 Oy,+ 02 , 
2Na2 02=2 Na2 O+O2. 
2HOI+H2 O2=2H2O+0l2, 
OI2 +H2 02=2H01+02, 
2II2 02=2112 O + O2. 
Exp. I . — 1 P. of an alkaline solution of peroxide of sodium rendered acid and titred, 
required 9-31 cub. centims. of permanganate solution, 
A solution of protochloride of manganese was precipitated by hydrate of sodiam, and 
1 P. of the above solution added to it. An equivalent portion of the hydrated protoxide 
was converted into the hydrated peroxide of manganese. 
The solution was immediately rendered acid with sulphuric acid, and 2 P. of the same 
solution added. 
III. Also 
whence 
IV. Again, 
iv+ence 
