Molybdic acid Chemical Properties

Melting point:

300 °C

Density 

3.1 g/mL at 25 °C (lit.)

bulk density

980kg/m3

vapor density 

6.2 (vs air)

storage temp. 

Store at +5°C to +30°C.

solubility 

slightly soluble in H2O; soluble in alkaline solutions

form 

white powder

Specific Gravity

3.1

color 

White powder

Odor

Odorless

PH

3.46(1 mM solution);2.94(10 mM solution);2.43(100 mM solution)

Water Solubility 

70 g/l (20 ºC)

Merck 

13,6263

Exposure limits

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

Cosmetics Ingredients Functions

PRESERVATIVE

InChI

1S/Mo.2H2O.2O/h;2*1H2;;/q+2;;;;/p-2

InChIKey

VLAPMBHFAWRUQP-UHFFFAOYSA-L

SMILES

O[Mo](O)(=O)=O

CAS DataBase Reference

7782-91-4(CAS DataBase Reference)

EPA Substance Registry System

Molybdate (MoO42-), dihydrogen, (T-4)- (7782-91-4)

Safety Information

Hazard Codes 

Xi,Xn

Risk Statements 

36/37/38-48/20/22-36/37

Safety Statements 

24/25-22-26

WGK Germany 

3

TSCA 

TSCA listed

HS Code 

28111990

Storage Class

11 - Combustible Solids

MSDS

• Language:English Provider:Molybdic acid
• Language:English Provider:ACROS
• Language:English Provider:ALFA

Molybdic acid Usage And Synthesis

Descriptioin

The monohydrate is a yellow solid consisting of monoclinic crystals; density 3.124 g/cm3 at 15°C; loses water of crystallization on heating at 70°C;
sparingly soluble in cold water (1.33 g/L at 18°C); moderately soluble in hot water 25.68 g/L at 70°C; soluble in caustic soda and sodium carbonate solution. The anhydrous acid consists of white hexagonal crystals; density 3.112 g/cm3; converts to molybdenum trioxide, MoO3 at 70°C; slightly soluble in water; soluble in alkalies and sulfuric acid.
The monohydrate is prepared by treating a molybdate solution with nitric acid, followed by crystallization which may take several weeks to separate out as a yellow solid. The anhydrous molybdic acid is obtained as a white crystalline substance by careful dehydration of the yellow monohydrate.

Chemical Properties

white crystals or crystalline powder

Uses

Determination of phosphates.

Uses

Molybdic acid is used as a precursor in the production of ammonium molybdate tetrahydrate and molybdenum(IV) sulfide. The mixture of molybdic acid in concentrated sulfuric acid is called as Froehde reagent, which finds application in analytical chemistry for the detection of alkaloids.

Definition

Molybdic acid of commerce iseither ammonium molybdate (molybdic acid 85%)or molybdenum trioxide. The use of the term inter-changeably for these compounds has caused con-fusion. Solutions of molybdic acid are very com-plex chemically since they show a great tendencyto polymerize.

reaction suitability

reagent type: catalyst
core: molybdenum

Synthesis

1. Ammonium molybdate nitrate neutralization method will be molybdenite crushed to 60 ~ 80 mesh, in the roaster at 500 ~ 550 ?? for oxidation roasting 6 ~ 8h, leaching with ammonia, to get ammonium molybdate solution, purification and removal of impurities, with nitric acid acid acidification, precipitation of molybdic acid precipitation precipitate precipitation, washed with warm water, centrifugal dewatering, drying, crushing, to get molybdic acid finished products.
2. The hydrochloric acid solution of molybdenum trioxide MoO₃ is heated at 40-60??C to obtain molybdic acid H₂MoO₄. In addition, adding concentrated nitric acid to an aqueous solution of ammonium heptamolybdate tetrahydrate (ammonium secamolybdate) (NH₄)₆Mo₇O₂₄-4H₂O, a monohydrate is obtained.
3. Molybdenum can be dissolved in AgNO₃ solution, precipitating molybdic acid and silver, and the reaction can be carried out quantitatively.
4. The content of about 15% of ammonium molybdate solution added to the same volume of nitric acid solution (relative density of 1.16), then add a certain amount of ammonium nitrate and a small amount of molybdic acid crystals (as the crystal species), stirred well, and then stood until the crystallization of the complete: filtration of the resulting precipitate washed with iced water until qualified, filtering and drying, that is, anhydrous molybdic acid.
5. Add concentrated HNO₃ to the aqueous solution of ammonium sec-molybdate to make the solution pH less than 1, or use barium sec-molybdate plus sulfuric acid and get.

Molybdic acid(7782-91-4)Related Product Information

• Molybdic acid (H2MoO4), disodium salt,Molybdic acid, disodium salt,Molybdic acid, disodium salt: (Disodium molybdate)
• Ammonium molybdate tetrahydrate
• Glycine
• Folic acid
• Molybdic acid barium salt
• Ethyl 2-(Chlorosulfonyl)acetate
• Sodium molybdate dihydrate
• ZINC MOLYBDATE
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• Ascoric Acid
• Phosphomolybdic Acid
• Molybdic acid copper(II) salt
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• NICKEL MOLYBDATE
• Hexaammonium molybdate
• Ammonium molybdate
• Molybdic acid monohydrate
• Molybdic acid hydride,MOLYBDIC ACID ANHYDRIDE