| Identification | More | [Name]
Trimanganese tetraoxide | [CAS]
1317-35-7 | [Synonyms]
MANGANESE(+2,+3)OXIDE
MANGANESE(II, III) OXIDE
MANGANESE OXIDE
MANGANESE TETRAOXIDE
MANGANESE TETROXIDE
Manganomanganic oxide
TETRAMANGANESE TRIOXIDE
TRIMANGANESE (II, III) TETRAOXIDE
trimanganese tetraoxide
TRIMANGANESE TETROXIDE
manganeseoxide(mn3o4)
manganesetetroxide(asmn)
Manganese(II,III)
Manganeseoxidebrownpowder
manganomanganic oxide (saline oxide)
MANGANESE(II, III) OXIDE 97%
MANGANESE (II,III) OXIDE, 99.5% 0.6-1.2 UM
MANGANESE (II,III) OXIDE, 97+% MN 70+%
Mn70%min.
MANGANESE(II,III) OXIDE (MN3O4) | [EINECS(EC#)]
215-266-5 | [Molecular Formula]
Mn3O4-2 | [MDL Number]
MFCD00016218 | [Molecular Weight]
228.81 | [MOL File]
1317-35-7.mol |
| Chemical Properties | Back Directory | [Appearance]
Grass-green powder.
but converted to Mn
3O4 if heated in air. Soluble in
acids; insoluble in water. Noncombustible. | [Melting point ]
1705°C | [density ]
4.8 g/mL at 25 °C(lit.)
| [vapor pressure ]
0Pa at 25℃ | [solubility ]
insoluble in H2O; soluble in HCl | [form ]
Powder | [color ]
brown | [Specific Gravity]
4.856 | [Stability:]
Stable. | [Water Solubility ]
insoluble H2O [KIR81]; soluble HCl, releasing Cl2 [MER06] | [Merck ]
13,5759 | [Uses]
Textile printing, analytical chemistry, catalyst
in manufacture of allyl alcohol, ceramics, paints,
colored glass, bleaching tallow, animal feeds, fertilizers, food additive and dietary supplement. | [CAS DataBase Reference]
1317-35-7(CAS DataBase Reference) | [EPA Substance Registry System]
1317-35-7(EPA Substance) |
| Hazard Information | Back Directory | [Chemical Properties]
Grass-green powder.
but converted to Mn
3O4 if heated in air. Soluble in
acids; insoluble in water. Noncombustible. | [General Description]
Brownish-black powder. Mp: 1565°C. Density 4.88 g cm-3. Insoluble in water. Occurs as the mineral hausmannite. | [Reactivity Profile]
MANGANESE TETROXIDE is non-combustible but decomposes, generating toxic fumes when strongly heated strongly in the air. A good oxidizing agent. Reacts with hydrochloric acid to form gaseous chlorine and soluble manganese salts. | [Hazard]
Chronic manganese poisoning and pulmonary effects. | [Health Hazard]
Manganese tetroxide affects the
central nervous system, and toxicity occurs
mostly in chronic form (manganism). | [Flammability and Explosibility]
Nonflammable |
| Safety Data | Back Directory | [Hazard Codes ]
Xi | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing . | [WGK Germany ]
2
| [RTECS ]
OP0895000
| [Safety Profile]
Experimental
reproductive effects. Reacts violently @
| [Toxicity]
mouse,LC,inhalation,> 3608ug/m3/2H (3.608mg/m3),American Industrial Hygiene Association Journal. Vol. 41, Pg. 494, 1980. |
| Questions And Answer | Back Directory | [Physical Properties]
Black tetragonal crystal; exhibits two allotropic modifications—a stable alpha phase, occurring in tetragonal crystalline form (as hausmannite) and an unstable beta modification; Moh’s hardness 5.5; insoluble in water; soluble in hydrochloric acid.
| [Occurrence and Use]
Manganese(II,III) oxide occurs in nature as the mineral hausmannite [1309-55-3]. It is used to make ferrites and thermistors. The oxide also is used in the thermite process for producing manganese.
| [Preparation]
Manganese(II,III) oxide is made by heating manganese(IV) oxide, MnO2, or manganese(III) oxide, Mn2O3, above 950°C. When Mn2O3 is heated in air, the temperature should be above 940°C, but if heated in oxygen, the temperature should be above 1,090°C. Also, heating manganese(III) oxide at 230°C in hydrogen yields Mn3O4. However, further heating above 300°C converts Mn3O4 formed to green manganese(II) oxide, MnO.
Manganese(II,III) oxide also is obtained by heating the dioxide, MnO2, with carbon at 600 to 700°C.
| [Reactions]
Manganese(II,III) oxide reacts with dilute acids forming the corresponding manganous salt and manganese(IV) oxide, MnO2:
Mn3O4 + 2H2SO4 → 2MnSO4 + MnO2 + 2H2O
The oxide, however, dissolves slowly in cold sulfuric acid forming a red solution that also contains manganic sulfate, Mn2(SO4)3:
Mn3O4 + 4H2SO4 → MnSO4 + Mn2(SO4)3 + 4H2O
Reaction with acetic acid yields manganese(II) acetate and manganese(III) oxide:
Mn3O4 + 2CH3COOH → Mn(CH3COO)2 + Mn2O3 + H2O
Manganese(II,III) oxide is reduced to manganese metal when heated with powdered aluminum (the Thermite process). The reaction is vigorous and exothermic:
3Mn3O4 + 8Al → 4Al2O3 + 9Mn
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