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Manganese Oxide and its PropertiesThe 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 sulfuric, and hot diluted sulfuric acids. The two main forms are a-Mn2O3 (the brown solution) and gMn2O3 (the red solution).
The Methods for Preparing Manganese oxidePreparation a-Mn2O3
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 nitrate must first be heated to 190degC, and then crushed, before being heated to 650degC.
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, 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 gMn2O3. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.
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