Inorganic Acids & Bases
REACH
Molybdic acid
CAS Number
7782-91-4
EC Number
231-970-5
What is Molybdic acid?
Molybdic acid (CAS 7782-91-4) is an inorganic molybdenum compound used industrially as a corrosion inhibitor and catalyst precursor.
Where is Molybdic acid used?
- Corrosion inhibitor formulations: provides molybdate ions that passivate metal surfaces in cooling water systems and industrial coatings
- Catalyst manufacturing: precursor to molybdenum-based catalysts for hydrodesulfurization, oxidation reactions and petrochemical refining
- Agriculture: micronutrient source for molybdenum-deficient soils, incorporated into fertilizer blends and foliar sprays
- Mining and metals: ore processing and starting material for molybdenum salts and pigments
- It delivers molybdate chemistry in solid form as a source material for downstream formulation.
Commercial specifications
- Purity typically specified at 85% or higher MoO₃ equivalent, technical grade
- Packaging ranges from small laboratory quantities to bulk industrial supply
- Specifications confirmed against buyer requirements for catalyst or agricultural use
Other Names (Synonyms)
molybdic(VI) acid|H2MoO4|[MoO2(OH)2]|Molybdate (MoO42-), dihydrogen, (T-4)-|I96N991J1N|RefChem:819194|dihydroxy(dioxo)molybdenum|Molybdate (MoO42-), hydrogen (1:2), (T-4)-
What are the physical properties of Molybdic acid?
Melting Point 300 °C
Density 3.1 g/mL at 25 °C(lit.)
Appearance white to slightly yellow powder
Color White powder
Odor Odorless
Form white powder
Water Solubility 70 g/l (20 ºC)
pH 3.46(1 mM solution);2.94(10 mM solution);2.43(100 mM solution)
How is Molybdic acid classified and handled safely? Learn More
Warning
GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H351 Suspected of causing cancer
H373 May causes damage to organs through prolonged or repeated exposure
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P271 Use only outdoors or in a well-ventilated area.
Which trade and regulatory codes apply to Molybdic acid?
HS Code 28111990
Storage Class 11 - Combustible Solids
WGK (Germany) 3