Examination of the Peroxide of Manganese. 85 
Dr. John passed chlorine through a solution of three hundred 
grains of protochloride, dissolved in 12 oz. water, cooled to 419. 
The liquid gradually congealed as the operation proceeded, and 
, _ produced a yellowish crystalline mass, which melted at a tem- 
== perature alittle above 41°. It was decomposed by evaporation.* 
_ . This may only have been the perchloride, surrounded by liquid 
lorine, for when I repeated this experiment, at a temperature 
re 419, [ obtained a yellowish crystalline mass, which, how- 
ever, on being placed between blotting paper to dry it, satya 
; " that a yellow liquid imparted that color to the salt, which itself 
-- was pink. Idid not however observe that it was decomposed 
by evaporation. » 
~ Sulphiirous acid.—This acid has no action upon the peroxide, 
even when passed over it ina heated tube; and with the deut- 
oxide it forms proto-hypo-sulphate. I do not think that the per- 
sulphite can be formed unless by double decomposition with 
some other salt. 
Carbonic acid.—It naan action upon ote peroxide, and as 
far as I have observed, it cannot be made to combine with it. 
The brown substance mentioned by Thomson, (Chem. Inor. 
Bodies, Vol. II,) and formed by decomposing the persulphate of 
manganese by carbonate of potassa, is most probably an hydrate 
of one of the oxides. 
Phosphoric acid.—_When digested upon peroxide, this acid 
forms a pink solution, giving the per reaction with tests, and 
“which upon evaporation leaves an uncrystallizable pasty mass, of 
a pink or violet color, which becomes colorless in a short time, 
most probably by decomposition. 
~ Boracic acid.—The borate can be readily formed by dissolving 
the peroxide in boracic acid. The solution thus formed by evap- 
oration leaves a whitish crystalline mass, soluble both in nitric 
and muriatic acid. 
| - Arsenious acid.-When peroxide is digested in arsenious sod, 
i 
° 
‘ 
; 
i 
\ 
i 
Pasa EAE 
a ae 
they unite and form asoluble pinkish white salt. 
If bi-arsenite of potassa be digested upon peroxide of man- 
; rtm: it forms a double salt, being arsenite of manganese and 
; — 
wot ioe Fob eS ae ed ne <b) F ‘ “gusta 
ee -. .,.” Berzelius, Traité de Chimie, Tom. IV, p. 170. - 
SSN pe ee ee A ES. Ba PS gh a 
