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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 a brown-colored 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 (or g-Mn2O3) and a-Mn2O3 (or b-Mn2O3).
The Methods for Preparation Manganese oxide
Preparation of aMn2O3
The easiest method is to heat manganese nitrate hexahydrate or pure b-MnO2 in air at 650degC until it reaches a constant weight. 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 g-Mn2O3
To 350 mL solution containing 2.2g manganese-sulfate-tetrahydrate under vigorous stirring 34 mL hydrogen peroxide solution at 3% was added dropwise. This was followed by 50 mL ammonia at 0.2 mol*dm-3 to yield 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 carefully dried at 250degC for 3days under reduced pressurized to obtain g-Mn2O3. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.
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