Ammonium dimolybdate Chemical Properties

Melting point:

300 °C

Density 

3.1

storage temp. 

Sealed in dry,Room Temperature

solubility 

soluble in H2O

form 

Powder

color 

white

Water Solubility 

Soluble in water.

Exposure limits

ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 1000 mg/m3

CAS DataBase Reference

27546-07-2(CAS DataBase Reference)

EPA Substance Registry System

Ammonium molybdenum oxide ((NH4)2Mo2O7) (27546-07-2)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

24/25

TSCA 

Yes

HS Code 

28417010

MSDS

• Language:English Provider:ACROS
• Language:English Provider:ALFA

Ammonium dimolybdate Usage And Synthesis

Physical Properties

Colorless, monoclinic crystal; density 2.276 g/cm3; decomposes on heating; soluble in water (decomposes); also soluble in acid; insoluble in alcohol and liquid ammonia.

Uses

Ammonium molybdates are used to prepare high purity grade molybdenum metal powder, sheet, or wire; for colorimetric analysis of phosphates and arsenates; for decorating ceramics; and as catalysts.

Preparation

Ammonium molybdate is prepared by treating molybdenum oxide with excess ammonia in an aqueous solution. The crystals are obtained after evaporation of water.
MoO3 + 2NH3 + H2O → (NH4)2MoO4

Reactions

Decomposes on heating or on treatment with alkalies; reacts with lead chloride and other metal salts to form their metal molybdates:
(NH4)2MoO4 + PbCl2 → PbMoO4 + 2NH4Cl
Reacts with phosphates or arsenates to form ammonium phosphomolybdate (NH4)3PO4•12MoO3, or ammonium arsenomolybdate, (NH4)3AsO4•12MoO3.

Chemical Properties

white powder(s); obtained by crystallization from a solution of MoO3 containing excess NH3; used as a high purity source for the preparation of Mo metal [KIR8l] [ALF93]

Physical properties

Colorless, monoclinic crystal; density 2.276 g/cm³; decomposes on heating; soluble in water (decomposes); also soluble in acid; insoluble in alcohol and liquid ammonia.

Uses

Ammonium molybdate (di) is used as pigments, agricultural fertilizer, color lakes and fabric fire retardant agent. It is also used as a raw material for the production of molybdenum wire, ceramic glazes and other molybdenum compounds. Further, it is used in photography, ceramics and paints. It is also used reagent for analysis as well as in the determination of phosphorus in analytical chemistry. In addition, it is used as a catalyst in the petrochemical industry.

Flammability and Explosibility

Not classified

Ammonium dimolybdate(27546-07-2)Related Product Information

• Ammonium chloride
• Ammonium formate
• Ammonium octamolybdate
• Ammonium dihydrogen phosphate
• Ammonium acetate
• Ammonium hydroxide
• Ammonium molybdate tetrahydrate
• Ammonium sulfate
• Ammonium carbonate
• AMMONIUM MOLYBDATE TS,AMMONIUM MOLYBDATE,AMMONIUM MOLYBDATE REAGENT,AMMONIUM MOLYBDATE (DI)
• Hexaammonium molybdate
• Ammonium nitrate
• AMMONIUM
• diammonium tridecaoxotetramolybdate(2-)
• AMMONIUM PHOSPHOMOLYBDATE
• AMMONIUM PHOSPHOMOLYBDATE HYDRATE
• Ammonium molybdate
• Molybdenum