Material Safety Data Sheet for Molybdic Acid

Identification

Product Name: Molybdic Acid
Chemical Formula: H2MoO4
CAS Number: 7782-91-4
Synonyms: Dihydroxidodioxomolybdenum, Molybdic(VI) acid
Recommended Use: Laboratory reagent, catalyst, pigment production
Supplier Information: Contact relevant manufacturer or local distributor
Emergency Phone Number: Refer to company-specific emergency contact

Hazard Identification

Signal Word: Warning
Hazard Class: Acute toxicity (Oral, Inhalation, Dermal), Eye Irritation
Pictograms: Exclamation mark
Hazard Statements: Harmful if swallowed, causes eye irritation, may cause respiratory irritation
Precautionary Statements: Avoid breathing dust, wear eye protection, wash hands thoroughly after handling
Routes of Exposure: Inhalation, ingestion, skin, and eye contact
Symptoms: Irritation to eyes, nose, throat, nausea, headache
Target Organs: Eyes, skin, respiratory tract

Composition / Information on Ingredients

Chemical Name: Molybdic Acid
Concentration: 98-100%
Impurities: Trace amounts of molybdenum trioxide or water
Molecular Weight: 161.95 g/mol
Additional Ingredients: No additional hazardous components known at significant levels

First Aid Measures

Inhalation: Move exposed person to fresh air immediately, keep at rest, seek medical attention if symptoms persist
Skin Contact: Remove contaminated clothing, rinse skin with plenty of water for at least 15 minutes, obtain medical help if irritation continues
Eye Contact: Rinse gently with water for several minutes, remove contact lenses if present, continue rinsing and get medical attention
Ingestion: Rinse mouth with water, do not induce vomiting, seek immediate medical advice
Note to Physicians: Treat symptomatically based on patient’s reactions, monitor for delayed symptoms especially respiratory or allergic reactions

Fire-Fighting Measures

Suitable Extinguishing Media: Use water spray, foam, carbon dioxide, dry chemical
Unsuitable Media: Do not use strong water jets directly on substance
Hazardous Combustion Products: Toxic fumes of molybdenum oxides may form
Special Protective Equipment: Firefighters wear self-contained breathing apparatus and chemical protective clothing
Fire and Explosion Hazards: No significant explosion hazard, can release irritating gases at high temperature
Advice for Firefighters: Prevent run-off from entering drains or water sources, use water spray to cool fire-exposed containers

Accidental Release Measures

Personal Precautions: Evacuate non-essential personnel, use protective equipment such as gloves and goggles, avoid raising dusty clouds
Environmental Precautions: Prevent material from entering soil, waterways, and sewers
Clean-up Methods: Collect spill using methods that avoid dust generation such as damp sweeping, place in labeled containers for proper disposal, ventilate area thoroughly
Further Precautions: Remove sources of ignition, wash spill site after removal, report major spills to authorities as required

Handling and Storage

Handling: Work in well-ventilated area, avoid contact with skin, eyes, and clothing, avoid breathing dust, always use personal protective equipment
Storage: Store in a cool, dry place away from incompatible substances, keep container tightly closed, segregate from strong acids, bases, reducing agents
Advice on Safe Use: Keep away from food and beverages, wash hands before eating or smoking, do not store near sources of ignition
Packaging Materials: Use original packages or containers resistant to corrosion and chemical degradation

Exposure Controls and Personal Protection

Permissible Exposure Limits: OSHA (as Mo): 5 mg/m³ (soluble compounds)
Engineering Controls: Provide local exhaust or general ventilation to keep airborne concentrations below regulations
Personal Protective Equipment: Safety goggles, chemical-resistant gloves, lab coats, particle filter respirator if ventilation is inadequate
Hygiene Measures: Remove contaminated clothing, wash thoroughly after handling, keep work area clean

Physical and Chemical Properties

Form: Crystalline powder
Color: White to yellowish
Odor: Odorless
Melting Point: Decomposes before melting
Boiling Point: Not applicable
Solubility: Slightly soluble in water, more soluble in acids and alkalis
Density: 3.1 - 3.4 g/cm³
Vapor Pressure: Not volatile
pH: Acidic in aqueous solution
Flash Point: Non-flammable
Other Data: Reacts with strong oxidizers

Stability and Reactivity

Chemical Stability: Stable under recommended storage conditions
Reactivity: Reacts with strong reducing agents and acids
Hazardous Reactions: May react with strong oxidizers producing toxic gases
Conditions to Avoid: Moisture, heat, direct sunlight
Hazardous Decomposition Products: Molybdenum oxides under extreme heat
Incompatible Materials: Alkalis, strong acids, powerful reducing agents

Toxicological Information

Routes of Entry: Inhalation, skin and eye contact, ingestion
Acute Toxicity: Oral LD50 (rat): 333 mg/kg
Chronic Effects: May cause liver and kidney damage from long-term exposure, potential for gastrointestinal upset and respiratory difficulties
Irritant Effects: Eyes, skin, upper respiratory tract
Sensitization: Not classified as a sensitizer
Carcinogenicity: Not listed by IARC, NTP, or OSHA
Reproductive Toxicity: Animal studies suggest high doses can affect fertility
Target Organs: Lungs, liver, kidneys

Ecological Information

Ecotoxicity: Toxic to aquatic life at high concentrations, low to moderate persistence in soil and water
Mobility: Moderately mobile in soil; can leach to groundwater in sandy soils
Persistence and Degradability: Not easily biodegraded, remains in environment
Bioaccumulative Potential: Not expected to bioaccumulate significantly in aquatic organisms
Additional Information: Avoid contamination of waterways, report large spills to environmental authorities

Disposal Considerations

Waste Treatment Methods: Dispose of in accordance with local, regional, and national regulations
Disposal of Packaging: Clean containers for recycling or disposal, avoid reuse without thorough cleaning
Recommended Disposal: Use hazardous waste facility, do not discharge to drains or natural water sources
Contaminated Materials: Treat as hazardous waste and dispose accordingly

Transport Information

UN Number: Not classified as a dangerous good for transport
Transport Hazard Class: Not regulated
Packing Group: Not applicable
Proper Shipping Name: Molybdic Acid
Transport Precautions: Protect package against moisture, prevent spillage by using sealed containers
Regulatory Status: Check national and international regulations for any updates

Regulatory Information

TSCA (U.S.): Listed
REACH (EU): Registered substance
SARA Title III (US): Not listed as extremely hazardous
California Proposition 65: Not listed
Other International Regulations: Subject to workplace safety and environmental protection guidelines
Label Requirements: Must display hazard and precautionary statements per GHS
Additional Regulations: Check local authorities for applicable restrictions and workplace exposure limits