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Manganese Oxide and its Properties
The chemical formula of
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 cold hydrochloric to form a brown-colored solution. In hot concentrated or dilute sulfuric, it becomes a reddish-brown solution. In hot nitric, MnO2 decomposes and manganese nitrogenate, then by heating, Mn3O4 decomposes and releases oxygen. 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
It can also be prepared by heating the divalent manganese in air at 600-800degC. 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 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 50mL ammonia 0.2 mol*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 of warm water, then put it into a vacuum desiccator, with phosphorus pentoxide below 100. 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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