Sodium molybdate Na₂MoO₄ – product information, price, where to buy | Manufacturer and distributor
Sodium molybdate Na₂MoO₄·2H₂O – high purity, competitive price, 24-hour delivery. We are an experienced distributor of chemical raw materials, offering this compound in various purity grades: technical, pure, and pro analysis (p.a.), both in an anhydrous form and as a dihydrate (Na₂MoO₄·2H₂O) intended for agricultural, industrial, and laboratory applications.
Our product is intended for manufacturers of foliar and soil fertilizers, the chemical and petroleum industries (catalysts), companies involved in water treatment and corrosion protection, research and analytical laboratories, and manufacturers of pigments, ceramics, and dyes. We include a Certificate of Analysis (CoA), a Safety Data Sheet (SDS), and complete technical documentation with every shipment. We guarantee consistent quality across batches, competitive wholesale prices, and technical support.
Main applications: molybdenum as a micronutrient in foliar and soil fertilizers for agricultural crops, corrosion inhibitor in refrigeration systems and water treatment, raw material for the production of industrial catalysts, component of pigments and ceramic dyes, analytical and chemical reagent in research laboratories.
Basic Specifications – Sodium molybdate Na₂MoO₄·2H₂O
Chemical formula, CAS number, and product form
| IUPAC name | Disodium tetraoxidomolybdate |
|---|---|
| Chemical formula | Na₂MoO₄·2H₂O (dihydrate), Na₂MoO₄ (anhydrous) |
| CAS number | 10102-40-6 (dihydrate), 7631-95-0 (anhydrous) |
| EC Number | 233-207-4 |
| Molar mass | 241.95 g/mol (dihydrate), 205.92 g/mol (anhydrous) |
| Mo content | ~39.7% (dihydrate), ~46.6% (anhydrous) |
| Appearance | White crystalline powder |
| Solubility in water | ~654 g/L (20°C) |
| pH of solution (5% in water) | 7.9 – 10.3 |
| Bulk density | 800–1,200 kg/m³ (depending on particle size) |
| Particle size (d50) | Available upon request – typically <200 µm |
| Loss on drying (LOD) | ≤ 13.0% (dihydrate), as per CoA |
| Thermal stability | Dehydration above 100°C, decomposition above 687°C |
Detailed parameters for a specific batch are available in the Certificate of Analysis (CoA).
Available Purities and Packaging
We offer sodium molybdate in the following purities: technical, pure, and pro analysi (p.a.), as well as in a grade suitable for agricultural applications. The product is available in packaging ranging from 1 kg (laboratory samples) to big bags and bulk shipments for industrial customers. We also provide shipments in packaging customized to customer requirements.
B2B Terms of Cooperation – Wholesale Sodium Molybdate
We work with both large manufacturing companies and smaller laboratories and firms seeking regular supplies of chemical raw materials. We offer flexible commercial terms, short lead times, and a dedicated account manager.
Wholesale Orders and Technical Samples
For new customers, we provide technical samples along with complete documentation (CoA, SDS). We fulfill wholesale orders based on individual pricing—contact us to receive a current price quote tailored to your order volume and frequency.
Contact Information and Inquiry Form
We accept inquiries via the contact form on our website, by email, or by phone. We respond within 24 hours on business days.
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Sodium molybdate – price and pricing factors
The price of sodium molybdate depends on several key factors: the selected product purity (technical, pure, p.a.), the order volume, the product form (anhydrous or dihydrate), and current market conditions for molybdenum raw materials. We offer preferential pricing and volume discounts to our regular customers.
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What is sodium molybdate?
Definition, chemical formula Na₂MoO₄·2H₂O, and general properties
Sodium molybdate is an inorganic chemical compound belonging to the group of molybdenum salts; it is a combination of molybdenum(VI) oxide and sodium hydroxide. Commercially, it is most commonly found as a dihydrate—Na₂MoO₄·2H₂O—that is, a form containing two molecules of water of crystallization. It is a white, crystalline powder that is highly soluble in water, which distinguishes it from many other heavy metal salts and makes it particularly useful in agricultural and industrial applications requiring aqueous solutions.
Sodium molybdate belongs to a group of molybdenum compounds with a +VI oxidation state, characterized by high chemical stability over a wide pH range. It is one of the primary sources of molybdenum used in industry, agriculture, and laboratories worldwide.
Sodium Molybdate and Other Molybdenum Compounds—Forms and Applications
Molybdenum is available in several chemical compound forms for industrial and agricultural use. Sodium molybdate (Na₂MoO₄) is highly soluble in water, making it the preferred choice for foliar fertilizers and aqueous solutions. Ammonium molybdate ((NH₄)₂MoO₄) is more commonly used as an analytical reagent and in certain catalytic processes. Molybdenum trioxide (MoO₃) is a form used primarily in metallurgy and alloy production. The choice of form depends on the specific application, the required solubility, and compatibility with other components of the formulation.
Physicochemical Properties of Sodium Molybdate
Appearance, water solubility, and solution pH
Sodium molybdate in the form of a dihydrate is a white, crystalline powder with a neutral odor. It is characterized by exceptionally high solubility in water—approximately 654 g/L at 20°C —which makes it one of the more soluble molybdenum salts and allows for the preparation of concentrated working solutions without the need for heating. The aqueous solution is basic: the pH of a 5-percent solution ranges from 7.9 to 10.3, which should be taken into account when formulating fertilizer blends and technical solutions.
Thermal Stability and Chemical Reactivity
Sodium molybdate dihydrate loses its water of crystallization above 100°C, transforming into an anhydrous form. Thermal decomposition of the compound occurs above 687°C. Under standard conditions, sodium molybdate is chemically stable, exhibits neither oxidizing nor reducing properties, and is compatible with most structural materials used in the chemical industry. It reacts with strong acids to form molybdic acid and the corresponding sodium salts.
Applications of Sodium Molybdate
Foliar and soil fertilizers—molybdenum for plants and crops
Sodium molybdate is the primary source of molybdenum used in the production of micronutrient fertilizers. Molybdenum is an essential micronutrient for plants—it plays a role in the function of nitrate reductase, the enzyme responsible for nitrogen uptake, and in the biological process of atmospheric nitrogen fixation by nodule-forming bacteria in legumes. Sodium molybdate is used both in foliar fertilizers (aqueous solutions) and as a soil amendment, particularly in acidic soils and those deficient in molybdenum.
Corrosion inhibitor – water treatment and cooling systems
Sodium molybdate is widely used as a corrosion inhibitor in industrial cooling systems, water systems, and central heating systems. It forms a protective passivation layer on metal surfaces, effectively inhibiting corrosion of carbon steel and metal alloys. It serves as an alternative to chromates—compounds with significantly higher toxicity—making it the preferred choice in systems where low ecotoxicity parameters for the inhibitor are required.
Catalysts in the Chemical and Petroleum Industries
In the petroleum and chemical industries, sodium molybdate is used as a precursor for catalysts in hydrocracking, hydrodesulfurization, and other high-pressure catalytic reactions. Molybdenum in the catalyst composition increases reaction activity and selectivity while extending the life of the catalyst bed. It is also used in organic synthesis as an oxidation catalyst.
Pigments, Dyes, and Ceramics
Sodium molybdate is used as a component of molybdenum pigments in ceramics, paints, and protective coatings. Molybdate-based pigments are characterized by good thermal and chemical resistance. In the ceramics industry, sodium molybdate serves as a component of glazes and ceramic bodies, influencing the optical and mechanical properties of the finished products.
Analytical Applications and Use as a Chemical Reagent
In analytical laboratories, sodium molybdate is used as a reagent in the spectrophotometric determination of phosphates (molybdenum blue), in the analysis of silica, and as a component of microbiological culture media. Available in pro analysi (p.a.) purity, it meets analytical and pharmacopoeial standards.
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Sodium molybdate in agriculture—application rates and benefits for crops
The role of molybdenum in soil – nitrate reductase and nitrogen fixation
Molybdenum is a micronutrient essential for proper plant growth and development, although it is required in very small amounts. Its key role is to participate in the structure and function of nitrate reductase—an enzyme that converts nitrates absorbed from the soil into forms that plants can absorb. Molybdenum is also essential for Rhizobium bacteria, which form root nodules on leguminous plants and fix atmospheric nitrogen. A molybdenum deficiency in the soil directly limits the effectiveness of nitrogen fertilization and biological nitrogen fixation, which results in lower yields and poorer fruit quality.
Molybdenum Deficiency—Symptoms on Leaves, Impact on Growth and Yields
Molybdenum deficiency manifests as characteristic symptoms on plant leaves: interveinal chlorosis (yellowing of the leaf blade while the veins remain green), deformation and waviness of the leaf margins, and, in advanced cases, necrosis of the leaf tissue. In legumes, molybdenum deficiency leads to inhibited nitrogen fixation and symptoms similar to those of nitrogen deficiency. Crops grown in acidic soils (pH below 5.5) are most susceptible to molybdenum deficiency, as molybdenum is poorly available to plants in such soils.
Dosage – foliar and soil application, soil pH
For foliar fertilization, sodium molybdate is used at a concentration of 0.05–0.1% (0.5–1 g/L of water), at a rate of 200–400 mL of solution per 1 ha of crop, calculated as pure molybdenum—typically 50–100 g Mo/ha. In soil application, higher doses are used, adjusted according to soil fertility and analysis results. The effectiveness of sodium molybdate in soil is strongly dependent on pH—at pH values above 6.0, the availability of molybdenum to plants increases significantly; therefore, on acidic soils, it is recommended to combine molybdenum fertilization with liming.
Sodium Molybdate vs. Ammonium Molybdate—Differences and Form Selection
Sodium molybdate and ammonium molybdate are the two most common forms of molybdenum used in agriculture and industry. Sodium molybdate is characterized by higher chemical stability over a wide pH range and is preferred in foliar fertilizers and aqueous solutions used in irrigation systems. Ammonium molybdate additionally provides ammonium nitrogen, which can be beneficial for certain crops; however, its solutions are less stable under alkaline conditions. The choice of form should depend on soil pH, crop type, and application method.
Safety and Storage
Classification in accordance with Regulation (EC) No. 1272/2008 (CLP/GHS)
Sodium molybdate is classified as a hazardous substance in accordance with Regulation (EC) No. 1272/2008 of the European Parliament and of the Council (CLP/GHS). It has been assigned the following hazard statements: H302 (harmful if swallowed), H318 (causes serious eye damage), and H411 (toxic to aquatic life with long-lasting effects). It is not classified as a carcinogen or mutagen. The full classification and labeling information is available in the Safety Data Sheet (SDS) included with every shipment.
Personal Protective Equipment and Guidelines for Handling the Product
When working with sodium molybdate, wear personal protective equipment: safety glasses or goggles (due to the risk of serious eye damage), chemical-resistant protective gloves (nitrile or neoprene), and when working with dust, an FFP2 dust mask. Avoid contact with the eyes and mucous membranes. In case of eye contact, immediately rinse with plenty of water for at least 15 minutes and consult a doctor.
Storage and Disposal
Store the product in tightly closed containers in a dry and cool place, away from sources of moisture. The shelf life under proper storage conditions is at least 2 years from the date of manufacture. Due to its toxicity to aquatic organisms (H411), disposal must be carried out in accordance with local regulations regarding chemical waste. Do not discharge into sewers or surface waters—detailed information is provided in the Safety Data Sheet (SDS) included with each shipment.
Technical Documentation
Safety Data Sheet (SDS), CAS Number 10102-40-6, and EC Number
We include complete technical documentation with every shipment of sodium molybdate: a Safety Data Sheet (SDS) compliant with the REACH Regulation, a Certificate of Analysis (CoA) confirming the purity and specifications of the product from a given batch, a product label compliant with CLP, and—upon request—documentation of compliance with agricultural or analytical standards.
Certificates and Quality Standards
Sodium molybdate is available in grades that meet analytical (p.a.), agricultural, and technical standards. Detailed information on the available certificates and standards for a specific product batch is provided upon request.
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Frequently Asked Questions (FAQ)
What is sodium molybdate and what is it used for?
Sodium molybdate (Na₂MoO₄) is an inorganic sodium salt of molybdic acid, most commonly found as the dihydrate Na₂MoO₄·2H₂O. It is a white, crystalline powder that is highly soluble in water. It is used as a source of molybdenum in micronutrient fertilizers for plants, as a corrosion inhibitor in cooling and water systems, as a precursor for industrial catalysts, as a component of ceramic pigments, and as an analytical reagent in research and chemical laboratories.
What are some other names for sodium molybdate?
Sodium molybdate is known by several names in commercial trade and scientific literature. The most common synonyms are: sodium molybdate (English name), disodium molybdate, sodium salt of molybdenic acid, and—for the hydrated form—sodium molybdate dihydrate or Na₂MoO₄·2H₂O. In technical documentation and chemical databases, it is identified by CAS number 10102-40-6 (dihydrate) or 7631-95-0 (anhydrous form).
What is sodium molybdate dihydrate Na₂MoO₄·2H₂O?
Sodium molybdate dihydrate is the commercial form containing two molecules of water of crystallization bound to each Na₂MoO₄ unit. It is the most common form of sodium molybdate in industrial and agricultural use—stable under storage conditions, easy to dose, and highly soluble in water. Dehydration to the anhydrous form occurs above 100°C. The molar mass of the dihydrate is 241.95 g/mol, while that of the anhydrous form is 205.92 g/mol; this must be taken into account when calculating doses and the molybdenum content in a preparation.
What are the main applications of sodium molybdate?
Sodium molybdate has five key areas of application. First, agriculture: as a source of molybdenum in foliar and soil fertilizers, which is essential for nitrate reductase and nitrogen fixation. Second, corrosion protection: as a corrosion inhibitor in refrigeration systems and water systems. Third, catalysis: as a precursor for catalysts in the petroleum and chemical industries. Fourth – ceramics and pigments: as a component of glazes and dyes. Fifth – analytics: as a reagent in the spectrophotometric determination of phosphates and silica.
Which company manufactures and distributes sodium molybdate?
Sodium molybdate is manufactured and distributed by Elpolap—an experienced manufacturer and distributor of chemical raw materials operating on the Polish and European markets. We offer sodium molybdate in various grades of purity: technical grade and pro analysis (p.a.), in both dihydrate and anhydrous forms, in packaging ranging from laboratory samples to bulk shipments. We include a Certificate of Analysis (CoA) and a Safety Data Sheet (SDS) with every shipment. Contact us to receive our current wholesale offer.
What is the recommended application rate of sodium molybdate per hectare of crop?
The dosage of sodium molybdate depends on the application method and crop type. For foliar fertilization, 50–100 g of pure molybdenum per hectare (Mo/ha) is typically used, which corresponds to approximately 170–340 g of sodium molybdate dihydrate per hectare, in a solution with a concentration of 0.05–0.1%. For soil application, the rates are higher and should be determined based on soil test results. Particular attention should be paid to soil pH—the effectiveness of molybdenum increases significantly above a pH of 6.0.
How do you dissolve sodium molybdate in water for foliar fertilization?
Sodium molybdate dissolves very easily in water due to its high solubility (~654 g/l). To prepare a foliar solution, measure out the appropriate amount of product according to the recommended dosage, pour it into a container with a small amount of warm water, and stir until completely dissolved; then top it off to the required volume. Check the solution’s pH before application—the optimal pH for foliar fertilizers is 5.5–7.0. Do not mix with strongly acidic products without first checking for compatibility.
Sodium molybdate vs. ammonium molybdate—which one to choose?
Sodium molybdate is preferred in foliar fertilizers, aqueous solutions, and industrial applications requiring stability over a wide pH range and the absence of an additional nitrogen load. Ammonium molybdate simultaneously provides ammonium nitrogen, which can be beneficial in certain fertilization systems; however, its solutions are less stable under alkaline conditions and may release ammonia. In analytical and catalytic applications, the choice of form depends on the process requirements—sodium molybdate is more versatile and easier to store.
Is sodium molybdate safe for humans and the environment?
Sodium molybdate requires caution during handling. According to the CLP classification (EC) No. 1272/2008, it is harmful if swallowed (H302), causes serious eye damage (H318), and is toxic to aquatic life with long-lasting effects (H411). It is not classified as a carcinogen or mutagen. When personal protective equipment (goggles, gloves) is used properly, the health risk is minimal. It is crucial to comply with the prohibition on discharging it into water bodies or the sewer system.
How does soil pH affect the effectiveness of sodium molybdate?
Soil pH has a decisive impact on the availability of molybdenum to plants. In acidic soils (pH below 5.5), molybdenum is strongly sorbed by iron and aluminum oxides, becoming virtually unavailable to plants despite its presence in the soil. As pH increases, the availability of molybdenum increases—at pH levels above 6.0, molybdenum is readily available to plants. Therefore, on acidic soils, sodium molybdate application should be combined with liming. In foliar fertilization, soil pH is less important, as molybdenum is absorbed directly through the leaves.
Where can you buy sodium molybdate in Poland?
Sodium molybdate in Poland can be purchased directly from Elpolap—a manufacturer and distributor of chemical raw materials with many years of experience. We offer deliveries throughout Poland and Europe, in various purities and packaging options, with complete technical documentation. We fulfill both sample orders for laboratories and bulk deliveries for industry and agriculture. Contact us via the form on our website to receive a current quote.
How to order sodium molybdate in bulk?
To place a wholesale order for sodium molybdate, contact Elpolap’s sales department via the contact form on our website, by email, or by phone. Based on the volume, required purity, and delivery frequency you provide, we will prepare a customized price quote. For new customers, we offer technical samples along with full documentation—a Certificate of Analysis (CoA) and a Safety Data Sheet (SDS). We respond to inquiries within 24 hours on business days and provide technical support at every stage of our partnership.
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This information is for technical and sales purposes only. It does not constitute an offer within the meaning of the Civil Code. All specifications and technical data are subject to change without prior notice.