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HomeProduct name listMANGANESE (III) OXIDE

MANGANESE (III) OXIDE

Synonym(s):Manganese sesquioxide

  • CAS NO.:1317-34-6
  • Empirical Formula: Mn2O3
  • Molecular Weight: 157.87
  • MDL number: MFCD00016217
  • EINECS: 215-264-4
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-09-04 23:37:13
MANGANESE (III) OXIDE Structural

What is MANGANESE (III) OXIDE?

Chemical properties

manganese(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.

The Uses of MANGANESE (III) OXIDE

Manganese(III) oxide is used to produce ceramic magnets and semiconductors. Further, it serves as a precursor to lithium manganese oxide. In addition to this, it acts as a useful battery cathode.

Definition

In nature as manganite, a manganese ore.

Preparation

Anhydrous 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

Hazard

Flammable in finely divided form. Toxic by inhalation of dust.

Flammability and Explosibility

Not classified

Safety Profile

Moderately toxic by subcutaneous and intratracheal routes. See also MANGANESE COMPOUNDS.

Properties of MANGANESE (III) OXIDE

Melting point: 1080°C (dec.)
Density  4.5 g/mL at 25 °C(lit.)
solubility  insoluble in H2O
form  Powder
color  Black
Specific Gravity 4.5
Water Solubility  Soluble in acid and ammonium chloride. Insoluble in water, alcohol and acetone.
Merck  14,5737
Exposure limits ACGIH: TWA 0.02 mg/m3; TWA 0.1 mg/m3
OSHA: Ceiling 5 mg/m3
NIOSH: IDLH 500 mg/m3; TWA 1 mg/m3; STEL 3 mg/m3
CAS DataBase Reference 1317-34-6(CAS DataBase Reference)
EPA Substance Registry System Manganese(III) oxide (1317-34-6)

Safety information for MANGANESE (III) OXIDE

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P271:Use only outdoors or in a well-ventilated area.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P302+P352:IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for MANGANESE (III) OXIDE

InChIKey GEYXPJBPASPPLI-UHFFFAOYSA-N

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