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 a brown solution when it dissolves in hydrochloric or nitric acids. The solution turns red in concentrated sulfuric, dilute or hot sulfuric acid. The two main forms are a-Mn2O3 (as it is also known) and gMn2O3 (gMn2O3).

The Methods for Preparation Manganese oxide

Preparation a-Mn2O3
a-Mn2O3 may be further oxidized, reduced by manganese oxychloride or prepared by heating divalent manganese salt at 600-800degC. The easiest way to achieve constant weight is to heat manganese oxide or manganese-nitrate hexahydrate in air at 650degC. If manganese is to be used as raw material for a product, the hexahydrate must first be heated to 190degC, and then crushed, before heating it to 650degC.

Preparation of gMn2O3
To 350 mL solution containing 2.2g of manganese-sulfate-tetrahydrate under vigorous stirring was added 34 mL solution of 3% peroxide followed by 50mL 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, wash with 1.5L hotwater, and then put it into a vacuum desiccator, below 100. After drying, you will obtain g-MnO (OH). This gMnO (OH) was dehydrated under reduced pressure at 250degC for 3days to obtain g-Mn2O3. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.

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