Basic information
- CAS
27546-07-2- Standard SMILES
[O]=[Mo](=[O])([OH])[OH]- InChIKey
VLAPMBHFAWRUQP-UHFFFAOYSA-L- Molecular formula
- H2-Mo-O4
- Average molar mass
- 161.96 g/mol
Overview
Molybdic acid is a molybdenum oxoacid. It is a conjugate acid of a hydrogenmolybdate.
Names & identifiers
- Preferred name
- Molybdic acid
- IUPAC
- dihydroxy(dioxo)molybdenum
- English name
- Ammonium dimolybdate
- Molecular formula
- H6MoNO+
- Molecular weight
- 132
Names & synonyms
Show more names
Database identifiers
- CAS
27546-07-2、7782-91-4- PubChem CID
- 82208
- ChEBI
CHEBI:25371- UNII
- I96N991J1N
- EC Number
- 231-970-5、248-517-2
Properties
Computed structural properties
- Topological polar surface area
- 74.6 Ų
- Hydrogen bond donors
- 2
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 0
- Heavy atoms
- 5
- Formal charge
- 0
- Complexity
- 81.3
Experimental & physicochemical properties
Chemical Classes
Metals -> Metals, Inorganic Compounds
Metals -> Metals, Inorganic Compounds
Physical Description
Dry Powder
Monohydrate: White solid; Slightly soluble in cold water, more soluble in hot water; [Merck Index] Yellowish odorless powder; Insoluble in water; [MSDSonline]
White powder with an ammoniacal odor; Soluble in water; [Alfa Aesar MSDS]
V (@25 °C)
Physicochemical properties
- Melting point
- 300 °C · 300 °C
- Density
- 3.1 · 3.1
- storage temp.
- Sealed in dry,Room Temperature
- solubility
- 2 O · soluble in H2O
- form
- Powder
- color
- white
- Water Solubility
- Soluble in water.
- Exposure limits
- 0.5 mg/m3NIOSH: · ACGIH: TWA 0.5 mg/m3NIOSH: IDLH 1000 mg/m3
- CAS DataBase Reference
- 27546 · 27546-07-2(CAS DataBase Reference)
- EPA Substance Registry System
- Ammonium molybdenum oxide ((NH4)2Mo2O7) (27546-07-2)
- Signal word
- Warning
- Hazard statements
- 332 · H332
- Precautionary statements
- 261 · P261-P271-P304+P340-P312
- Hazard Codes
- Xi
- Risk Statements
- 36 · 36/37/38
- Safety Statements
- 24 · 24/25
- TSCA
- TSCA listed
- HS Code
- 28417010 · 28417010
- REACH Registrations
- Active
Safety & regulation
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 57.3% (125 of 218) of all reports.
Warning
H319 (42.2%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
P260, P261, P264+P265, P271, P280, P304+P340, P305+P351+P338, P319, P337+P317, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 218 reports by companies from 13 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
This chemical does not meet GHS hazard criteria for 99.1% (211 of 213) of all reports.
Hazard information
Regulatory Information
Chemical: Molybdate (MoO42-), dihydrogen, (T-4)-
Chemical: Molybdate (Mo2O72-), diammonium
Molybdate (MoO42-), hydrogen (1:2), (T-4)- is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Molybdate (MoO42-), hydrogen (1:2), (T-4)- are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
Status: Active Update: 01-06-2022 https://echa.europa.eu/registration-dossier/-/registered-dossier/17317
Status: Active Update: 13-09-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/14454
Molybdate (Mo2O72-), diammonium: Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.
Other Safety Information
IMAP assessments - Molybdenum Trioxide and Molybdic Acid: Human health tier II assessment
IMAP assessments - Molybdate (Mo2O72-), diammonium: Human health tier I assessment
Hazards Summary
Prepared as the monohydrate, molybdic(VI) acid has the formula H2MoO4; [Merck Index] An eye irritant; [eChemPortal: ERMA] An irritant; [MSDSonline] See Molybdenum.
May cause irritation; [Alfa Aesar MSDS] See Sodium molybdate(VI) dihydrate.
Hazard Classes and Categories
Not Classified
Eye Irrit. 2 (42.2%)
Carcinogenicity - category 2
Safety & protection
Threshold Limit Values (TLV)
0.5 [mg/m3], as Mo, respirable fraction
0.5 [mg/m3], as Mo, respirable fraction
Permissible Exposure Limit (PEL)
5.0 [mg/m3], as Mo
5.0 [mg/m3], as Mo
Protective Action Criteria (PAC)
12 [mg/m3]
130 [mg/m3]
770 [mg/m3]
2.5 [mg/m3]
28 [mg/m3]
170 [mg/m3]
Immediately Dangerous to Life or Health (IDLH)
1000.0 [mg/m3], as Mo
1000.0 [mg/m3], as Mo
Safety data
- tsca
- TSCA listed
- hs_code
- 28417010
- risk_code
- 36/37/38
- Signal word
- Warning
- hazard_code
- Xi
- safety_code
- 24/25
- Hazard statements
- H332
- REACH Registrations
- Active
- Precautionary statements
- P261-P271-P304+P340-P312
Chemistry & industry
Uses & manufacturing
Uses
Used in chemical synthesis, for extraction, refining, and processing of metals, as a coloring agent, construction materials additive, flame retardant, process regulator, catalyst, and in the production of other molybdenum compounds and alloys; [IUCLID] Used to make catalysts, activated charcoal impregnants, molybdenum compounds, base metals and alloys, and large scale and fine chemicals, to formulate lubricants-lubricant additives-greases, coatings-paints-thinners, fillers-putties-plasters, metal surface treatment products (including those for galvanizing and electroplating), non-metal surface treatment products, flux coating/core welding and soldering products, and laboratory chemicals, and as a micronutrient in fertilizers; [ExPub: ECHA REACH Registrations]
Welding [Category: Weld]
General Manufacturing Information
All Other Basic Organic Chemical Manufacturing
Molybdate (MoO42-), hydrogen (1:2), (T-4)-: ACTIVE
Applications
UsesAmmonium 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.
UsesAmmonium 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.
Preparation methods
PreparationAmmonium 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
Upstream & downstream products
Upstream raw materials
Suppliers100 total
Related reactions
Compound notes
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