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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 or hot sulfuric acid. The two main forms are a-Mn2O3 (and g-Mn2O3).
The Methods for Preparing Manganese oxidePreparation a-Mn2O3
a-Mn2O3 may be further oxidized, reduced or prepared by heating manganese divalent salt in air at 600-800degC. It’s easiest to heat manganese oxide or pure bMnO2 at 650degC until it reaches a constant mass. If manganese is to be used as raw material for a product, the nitrate must first be heated to 190degC, and then crushed, before heating it 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 produce 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 hotwater, 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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