1822.] Properties of Peroxide of Hydrogen, 47 



Arsenic in powder and peroxide containing only one-ninth of 

 its volume of oxygen. No effervescence ; the hquor becomes 

 immediately acid. This acid rendering the peroxide more fixed, 

 it remains for a long time more or less oxidized. 



Molyhden reduced to powder and pure peroxide. Very violent 

 action ; combustion of the metal with light ; great extrication of 

 heat ; production of a very soluble acid, the taste of which is 

 rather strong, and gives a yellow colour to the water. All the 

 molybden disappears when the peroxide is in excess. 



Molyhden reduced to powder, and peroxide containing only 

 nine volumes of oxygen, budden brisk effervescence ; production 

 of acid ; absorption or disengagement of all the oxygen : at the 

 end of 15 hours, the liquor was of a superb blue colour. 



Tungsten, chrome, and pure peroxide. The action weak at 

 first ; and with the tungsten only after some time it becomes 

 violent. 



Potassium and pure peroxide. Sudden and violent action ; 

 vivid combustion ; disengagement of oxygen, and formation of 

 alkah : the experiment ought not to be made in a narrow tube, 

 for sometimes explosion occurs. 



Sodium and pure peroxide. The same phenomena as with 

 potassium. 



Manganese and pure peroxide. The metal, in the form of 

 small globules, produces brisk effervescence, and deoxidizes the 

 liquor readily. May it not be imagined that it is first oxidized, 

 and that it is the oxide which expels the oxygen ? Yet the glo- 

 bules did not appear to be altered. In powder it acts still more 

 strongly, becoming very soon violent : at the same time that the 

 oxygen is disengaged, great heat is excited. 



Manganese and peroxide containing only nine times its volume 

 of oxygen. Brisk and sudden effervescence ; no heat ; complete 

 deoxidizement of the Hquor in a short time. 



{Zinc.) Action very weak. 



Iron, tin, antimony, tellurium. No, or scarcely any, action at 

 all, even with the concentrated liquor. 



Action of the simple non-metallic Combustibles. 



Among the simple non-metaUic combustible bodies, there are 

 only selenium and charcoal, which act upon peroxide of hydrogen 

 in a marked manner. 



Selenium in powder and pure peroxide. Sudden and very 

 violent action; disengagement of great heat without Hght; com- 

 plete acidification of the selenium, which, owing to this, imme- 

 diately dissolves. 



Selenium and peroxide containing only nine times its volume 

 of oxygen. No heat. Occasional bubbles are disengaged ; but 

 the liquor is acidified in a few minutes. 



Charcoal in fine powder and pure peroxide. Sudden and very 

 brisk action ; production of very considerable heat ; disengage- 



