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 sulfuric, or hot dilute sulfuric. The two main forms are a-Mn2O3 (as it is also known) and gMn2O3 (gMn2O3).
The Methods for Preparing Manganese oxide
Preparation a-Mn2O3
It can also be prepared by heating the divalent manganese in the air to 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.
Preparation g-Mn2O3
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, separate it, and wash with 1.5L warm water. Then, put it into a vacuum desiccator and add phosphorus pentoxide below 100. This g.MnO (OH) was dehydrated under reduced pressure at 250degC for three days. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.
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