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MANGANESE (III) OXIDE Basic information
MANGANESE (III) OXIDE Chemical Properties
  • Melting point:1080°C (dec.)
  • Density 4.5 g/mL at 25 °C(lit.)
  • form Powder
  • Specific Gravity4.5
  • color Black
  • Water Solubility Soluble in acid and ammonium chloride. Insoluble in water, alcohol and acetone.
  • Merck 14,5737
  • CAS DataBase Reference1317-34-6(CAS DataBase Reference)
  • EPA Substance Registry SystemManganese(III) oxide (1317-34-6)
Safety Information
  • Hazard Codes Xi
  • Risk Statements 36/37/38
  • Safety Statements 26-36
  • WGK Germany 3
  • RTECS OP0915000
  • TSCA Yes
MANGANESE (III) OXIDE Usage And Synthesis
  • Chemical Propertiesmanganese(III) oxide is a black, lustrous powder, sometimes tinged brown. Very hard.decomposes at 1080℃. Soluble in cold hydrochloric acid; not soluble in nitric acid (decomposes), hot sulfuric acid; insoluble in water. Noncombustible.
    manganese(III) oxide
    manganese(III) oxide is obtained by igniting manganese(IV) oxide or a manganese(II) salt in air at 800°C. It reacts slowly with cold dilute acids to form manganese(III) salts. Manganese(III) oxide occurs in nature as braunite (3Mn2O3.MnSiO3 ) and the monohydrate (Mn2O 3.H2O) occurs in the mineral manganite. The manganese(III) oxide crystal lattice contains Mn3+ and O2– ions. With concentrated alkalis, it undergoes disproportionation to give manganese(II) and manganese(IV) ions.
  • DefinitionIn nature as manganite, a manganese ore.
  • PreparationAnhydrous manganese(III) oxide is found as the mineral braunite, Mn2O3, while a hydrated form, Mn2O3.H2O, which is chemically more reactive, occurs as manganite. Manganese forms both anions and cations in oxidation state +3. Simple salts of tervalent manganese are not stable. However, complexes are more stable, the hexacyanomanganates(III) being an example: K3Mn(CN)6 is a red crystalline solid, isomorphous with potassium hexacyanoferrate(III) and slowly hydrolysed.
    Manganese(III) oxide is formed as a grey solid by heating manganese(IV) oxide to 700°C for several hours:
    4MnO2 ---> 2Mn203 + O2
    It is converted into trimanganese tetroxide when heated above 940°C in air or reduced by hydrogen above 230°C. Hot concentrated hydrochloric acid is oxidized to chlorine by manganese(III) oxide:
    Mn203 (s) + 6H + + 2e- ==2Mn2+ + 3H2O
    Mn203 (s) + 6H + + 2Cl- ---> 2Mn2+ + 3H2O + Cl2
  • HazardFlammable in finely divided form. Toxic by inhalation of dust.
  • Safety ProfileModerately toxic by subcutaneous and intratracheal routes. See also MANGANESE COMPOUNDS.
MANGANESE (III) OXIDE Preparation Products And Raw materials
MANGANESE (III) OXIDE(1317-34-6)Related Product Information
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