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 or dilute sulfuric, MnO2 in nitric, and manganese-nitrate (MnN) in diluted sulfuric. The two main forms are a-Mn2O3 (as it is also known) and gMn2O3 (gMn2O3).
The Methods for Preparing Manganese oxide
Preparation a-Mn2O3The 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 pure bMnO2 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 manganese-sulfate-tetrahydrate under vigorous stirring 34 mL hydrogen peroxide was added dropwise. This was followed by 50mL ammonia 0.2mol*dm-3 to form g-MnO (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 of warm water, then put it into a vacuum desiccator, with phosphorus pentoxide below 100. This g -MnO (OH) was carefully dried at 250degC for 3days under reduced pressure to obtain g -Mn2O3. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.
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