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1317-35-7

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Identification

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

Appearance
brownish-black powder
Appearance
Grass-green powder. but converted to Mn 3O4 if heated in air. Soluble in acids; insoluble in water. Noncombustible.
Melting point 
1705°C
mp 
1705°C
density 
4.8 g/mL at 25 °C(lit.)

form 
Powder
color 
brown
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

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.

Safety Data

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 @

Raw materials And Preparation Products

Material Safety Data Sheet(MSDS)

Questions And Answer

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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