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Manganese Oxide and its Properties

The chemical formula of manganese oxide Its molecular weight (157.88) is Mn2O3. The black cubic crystal has a relative densities of 4.50. Manganese oxide does not dissolve in water, acetic or ammonium chloride solutions, but is soluble with other inorganic acids.
Manganese oxide is dissolved in a brown solution by cold hydrochloric, changes to a reddish-brown solution when heated dilute or concentrated sulfuric, breaks down into MnO2 in hot nitric, then Mn3O4 and manganese Nitrate with heating, and finally decomposes and releases oxygen in Mn3O4. The two main forms are a-Mn2O3 (as it is also known) and gMn2O3 (as it is also known).

The Methods for Preparation Manganese oxide

Preparation of aMn2O3
a-Mn2O3 may be further oxidized, reduced by manganese oxychloride or prepared by heating divalent manganese salt at 600-800degC. The simplest method is to heat manganese oxide or pure bMnO2 at 650degC until it reaches a constant mass. If manganese is to be used as raw material for a product, the hexahydrate must first be heated to 190degC, and then crushed, before being heated to 650degC.

Preparation g-Mn2O3
To 350 mL solution containing 2.2g of manganese-sulfate-tetrahydrate under vigorous stirring was added 34 mL solution of 3% peroxide followed by 50 mL ammonia 0.2mol*dm-3 to generate gMnO(OH). Heat is used to quickly boil the dark brown, or black, suspension emitting oxygen. After boiling for four minutes, filter the solid, separate it, wash with 1.5L hotwater, then put it into a vacuum desiccator, with phosphorus octoxide below 100. This gMnO (OH) was dehydrated under reduced pressure at 250degC for 3days to obtain gMn2O3. Additionally, g -MnO2 is heated at 500degC and reduced pressure for 78 hours to prepare g -Mn2O3.

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