86 Examination of the Peroxide of Manganese. 
~ Chromic acid.—Chromic acid seems to have no action upon 
the peroxide, but a chromate may be formed by digesting the 
peroxalate in chromic acid. The solution is of a dark chestnut 
brown, but it cannot be evaporated or crystallized, as it is a 
posed by the application of heat. 
Bichromate of potassa has no action —— the deutoxide ae” 
manganese. 
Oxalic acid.—This acid has a violent effect upon the perox- 
ide. Oxygen is given off, the insoluble protoxalate is precipita- ‘ 
ted, while a soluble peroxalate remains in solution. By careful 
evaporation it may be crystallized, but it is very apt to be de- 
composed, forming an insoluble salt, most probably the protoxa- 
late. It dissolves in muriatic and nitric acid. It was analyzed 
by dissolving and precipitating the oxalic acid by chloride of cal- 
cium; while another portion was calcined and converted into 
dines genobo-menigacic oxide. ‘Treated in this manner it showed 
27.4348 per cent. of oxalic acid, and 8.5 of manganoso-manganie 
oxide =11.73 of peroxide. This leaves a very large - centage 
for water of wilder. Thus 
Oxalic acid, - - - 27.4348 : 
Peroxide of manganese, - - - 1.30 rexr ee 
Water and loss, - - - - 60.8352 
100.0000 
The 11.73 of oxide, requires very nearly 16. of oxalic acid; 
which leaves 11.4348 of free acid, so that this salt, in common 
with the others, possesses a great excess of acid. 
If binoxalate “Of potassa be digested upon the deutoxide oft man- 
ganese, in the cold, a pink colored solution is formed, which by 
standing becomes yellow, letting falla pink powder. If the so- 
lution of the binoxalate be hot, the action is very violent, and 
the resulting solution is yellow. By evaporation it leaves a crys- 
talline, almost tasteless mass, partly white and partly green, and 
which is readily dissolved in water, 
Acetic acid.—Glacial acetic acid does not form a per-salt when 
digested on peroxide of manganese. _- 
Tartaric acid.—If this acid be digested upon peroxide, oxy- 
gen is given off and the prototartrate is formed. But if we dis- 
solve deutoxide instead of peroxide, a pertartrate results, which 
on being evaporated leaves the salt of a light yellow or straw 
color. 
