Sodium Tungstate Uses

Sodium tungstate is an inorganic compound with the chemical formula Na2WO4. It is a white, crystalline powder that is commonly used as a source of tungsten for various applications, including the production of tungsten carbide and other tungsten-containing alloys.

The price of sodium tungstate can vary depending on several factors, including the purity of the compound, the quantity purchased, and market demand. As of September 2021, the price of sodium tungstate ranged from approximately $30 to $50 per kilogram.

It is important to note that the price of sodium tungstate is subject to fluctuations due to changes in supply and demand, as well as fluctuations in the prices of raw materials used in its production. Additionally, pricing may also be affected by factors such as import/export regulations and geopolitical events that impact global trade.

Overall, the price of sodium tungstate can be influenced by a variety of factors and can vary over time, so it is important for buyers to stay informed on market trends and pricing dynamics in order to make informed purchasing decisions.

Sodium tungstate is a highly soluble compound in water, with a solubility of approximately 143 g/L at 25°C. This high solubility arises from the compound's ionic nature, as it dissociates completely into sodium cations (Na+) and tungstate anions (WO4^2-) in aqueous solution. The solubility of sodium tungstate can be influenced by factors such as temperature, pH, and the presence of other ions in solution. At higher temperatures, the solubility of sodium tungstate increases, while at lower pH values, the solubility decreases due to the protonation of the tungstate anion. Additionally, the presence of competing ions such as calcium or magnesium can reduce the solubility of sodium tungstate through the formation of insoluble precipitates. Overall, sodium tungstate exhibits high solubility in water under normal conditions.

Sodium tungstate is typically prepared by reacting tungsten oxide or tungstic acid with sodium hydroxide. The reaction takes place in aqueous solution and produces sodium tungstate, water, and sometimes hydrogen gas (if excess sodium hydroxide is used).

The general equation for the reaction is:

WO3 + 2 NaOH → Na2WO4 + H2O

Alternatively, if ammonium paratungstate (APT) is available, it can be converted to sodium tungstate by reacting it with sodium hydroxide:

(NH4)10[H2W12O42]·4H2O + 12 NaOH → Na2WO4·2H2O + 10 Na2[W12O40]

After the reaction is complete, the resulting solution can be filtered to remove any insoluble impurities. The filtrate can then be concentrated by evaporation to yield solid sodium tungstate.

It is important to note that the handling of tungsten compounds should be done with care as they can be toxic and carcinogenic. Proper protective equipment should be worn when handling these materials.

Sodium tungstate dihydrate is a compound with the chemical formula Na2WO4·2H2O. It is a white, crystalline solid that is soluble in water. The compound is commonly used as a precursor for the synthesis of other tungsten compounds and as a reagent in analytical chemistry.

The structure of sodium tungstate dihydrate consists of sodium cations (Na+) and tungstate anions (WO42-) that are held together by ionic bonds. The two water molecules in the formula unit are coordinated with the sodium cations through hydrogen bonding.

The compound has a molar mass of 329.86 g/mol and a density of 3.24 g/cm3. Its melting point is approximately 698 °C and it decomposes at higher temperatures.

In terms of its safety, sodium tungstate dihydrate is considered to be relatively low in toxicity. However, it should still be handled with care, as it can cause skin and eye irritation upon contact. Dust or powder from the compound should not be inhaled, as it may cause respiratory irritation. Proper protective equipment, such as gloves and goggles, should be worn when handling the compound.

The molecular weight of sodium tungstate dihydrate is 329.86 g/mol.

Sodium tungstate sigma是一种无机化合物，化学式为Na2WO4，由两个钠离子和一个四氧化钨离子组成。它是白色粉末状晶体，在水中易溶解。它通常用作催化剂、检测、电镀等领域的原材料。此外，它也被广泛用于医学领域，例如用于治疗慢性淋巴细胞白血病。在制备过程中，sodium tungstate sigma可以通过将钨酸与氢氧化钠或碱金属碳酸盐反应得到。

Sodium tungstate (Na2WO4) is an inorganic compound composed of sodium cations and tungstate anions. It is a white crystalline powder, soluble in water and slightly soluble in alcohol. Sodium tungstate has various applications as a catalyst, reagent, and as a raw material for producing tungsten metal. In addition, it is used in the production of other tungsten-based compounds, such as tungsten carbide.

The physical properties of sodium tungstate include a melting point of 930 °C, a boiling point of 1,650 °C, and a density of 5.9 g/cm3. The compound has a monoclinic crystal structure, with a space group of P21/c. The tungstate anions in the crystal lattice are surrounded by sodium cations, forming a three-dimensional network.

Sodium tungstate is typically prepared by reacting tungsten ores or concentrates with sodium hydroxide (NaOH) or sodium carbonate (Na2CO3) in the presence of air or oxygen. The resulting sodium tungstate solution is then purified and crystallized to obtain the final product.

In summary, sodium tungstate is an important inorganic compound with various applications in industry, chemistry, and materials science. Its preparation involves the reaction of tungsten ores or concentrates with sodium hydroxide or carbonate, followed by purification and crystallization.

Sodium tungstate dihydrate is a compound with the chemical formula Na2WO4•2H2O. It is highly soluble in water, with a solubility of approximately 143 g/L at room temperature (25°C). The high solubility of this compound is due to its ionic nature, as it dissociates into sodium cations (Na+) and tungstate anions (WO42-) when dissolved in water. The presence of two water molecules in the formula also contributes to its solubility, as the water molecules can interact with the ions through hydrogen bonding. Overall, the solubility of sodium tungstate dihydrate in water is quite high, making it easily dissolve and readily available for use in various applications such as in the production of tungsten metal and ceramics.

Sodium tungstate is an inorganic compound with the chemical formula Na2WO4, which is also known as sodium wolframate. It is usually obtained as a white solid, which is soluble in water and exhibits a moderate level of hygroscopicity.

Some of the important properties of sodium tungstate are listed below:

1. Melting and Boiling Point: The melting point of sodium tungstate is 1,465°C (2,669°F), and it does not have a boiling point at atmospheric pressure due to its decomposition before reaching the boiling point.

2. Density: The density of sodium tungstate is 5.9 g/cm³, which is relatively high compared to other inorganic compounds.

3. Solubility: Sodium tungstate is highly soluble in water, with a solubility of approximately 78 g/100 mL at room temperature. It is also slightly soluble in ethanol.

4. pH: When dissolved in water, sodium tungstate solutions exhibit a slightly alkaline pH, typically around 8-9.

5. Stability: Sodium tungstate is stable under normal conditions but decomposes when exposed to strong acids or reducing agents.

6. Uses: Sodium tungstate is widely used in various industrial applications, including the production of tungsten metal and alloys, as a catalyst in organic synthesis, and as a reagent in analytical chemistry.

Overall, sodium tungstate is a versatile inorganic compound with unique properties that make it useful in a variety of applications.

The chemical formula for sodium tungstate is Na2WO4.

Sodium tungstate is a compound with the chemical formula Na2WO4. It has several common uses in industry, including:

1. Industrial Catalyst: Sodium tungstate is used as a catalyst in various industrial processes, such as the production of acrylic acid and the refining of petroleum.

2. Textile Industry: It is also used in the textile industry as a mordant, which helps to improve the dyeing properties of fabrics.

3. Fireproofing: Sodium tungstate is an effective fire retardant and is used in the manufacturing of fireproof materials.

4. X-ray Absorption: It is used as a contrast agent in medical imaging for X-ray absorption imaging, as well as in research applications, such as protein crystallography.

5. Soil Amendment: Sodium tungstate can be added to soil as a fertilizer supplement to increase the availability of nutrients for plant growth.

Overall, sodium tungstate has a diverse range of applications in industry due to its unique properties and versatility.

Sodium tungstate (Na2WO4) is commonly used as a catalyst in various chemical reactions, including the oxidation of alcohols, epoxidation of olefins, and synthesis of heterocyclic compounds. The catalytic activity of sodium tungstate is attributed to its high surface area, Lewis acid sites, and redox properties.

In the oxidation of alcohols, sodium tungstate can activate molecular oxygen and facilitate the transfer of oxygen atoms to the alcohol substrate, leading to the formation of aldehydes, ketones, or carboxylic acids. The mechanism involves the adsorption of the alcohol on the catalyst surface, followed by the activation of O2 and the formation of a peroxy intermediate, which then reacts with the alcohol to form the desired product.

In the epoxidation of olefins, sodium tungstate can act as a heterogeneous catalyst that promotes the addition of oxygen to the double bond of the olefinic substrate, resulting in the formation of an oxirane ring. The reaction mechanism involves the coordination of the olefin to the tungstate ion, followed by the activation of a peroxide species that initiates the epoxidation process.

In the synthesis of heterocyclic compounds, sodium tungstate can catalyze the cyclization of suitable precursors to form a variety of heterocycles, such as furans, pyridines, and indoles. The mechanism typically involves the activation of the precursor molecule via coordination to the tungstate ion, followed by intramolecular cyclization to give the desired product.

Overall, sodium tungstate is a versatile and effective catalyst that finds applications in a wide range of organic transformations.

Sodium tungstate is a compound that may pose environmental and health hazards.

Environmental hazards associated with sodium tungstate include its potential toxicity to aquatic organisms and the potential for bioaccumulation in the food chain. Sodium tungstate can also contaminate soil and groundwater if spilled or improperly disposed of.

Health hazards associated with sodium tungstate exposure include irritation to the skin, eyes, and respiratory system. Long-term exposure to sodium tungstate may lead to lung damage, kidney damage, and reproductive issues. Ingestion of large amounts of sodium tungstate can cause abdominal pain, nausea, vomiting, and diarrhea.

To minimize environmental and health risks associated with sodium tungstate, appropriate safety measures should be taken during its production, handling, use, and disposal. This may include proper personal protective equipment, adequate ventilation, and adherence to regulatory guidelines for waste management.

There are several methods for synthesizing sodium tungstate, including:

1. Reaction of tungsten oxide with sodium hydroxide: Tungsten oxide is dissolved in a solution of sodium hydroxide and heated to form sodium tungstate.

2. Reaction of tungstic acid with sodium hydroxide: Tungstic acid is added to a solution of sodium hydroxide and heated to form sodium tungstate.

3. Double decomposition reaction: Sodium tungstate can be synthesized by mixing solutions of sodium carbonate and tungstic acid or sodium tungstate and a soluble salt containing tungsten, such as ammonium metatungstate.

4. Reduction of tungsten trioxide: Tungsten trioxide is mixed with sodium borohydride and heated to produce sodium tungstate.

5. Electrolysis: Sodium tungstate can also be produced through the electrolysis of molten sodium tungstate or a mixture of tungsten oxide and sodium hydroxide using an inert electrode.

The choice of synthesis method may depend on factors such as cost, purity requirements, and desired yield.

The solubility of sodium tungstate in water is approximately 42 g/100 mL at room temperature (25°C). This means that under normal conditions, 42 grams of sodium tungstate can dissolve in 100 milliliters of water at 25°C before the solution becomes saturated. The solubility of sodium tungstate may vary depending on factors such as temperature, pressure, and the presence of other compounds in the water.

Sodium tungstate is a chemical compound with the formula Na2WO4. It is commonly available in several different forms and grades, depending on its intended use and level of purity required.

One form is anhydrous sodium tungstate, which is the purest form of the compound and has a white crystalline appearance. Another form is hydrated sodium tungstate, which contains water molecules within its crystal structure and appears as a yellow or white powder.

In terms of grade, sodium tungstate can be categorized as technical grade or high-purity grade. Technical grade sodium tungstate typically contains impurities and is used in a variety of industrial applications, such as catalysts, pigments, and fire retardants. High-purity grade sodium tungstate has a much lower level of impurities and is used in more specialized applications, such as in the production of tungsten metal and alloys, as well as in analytical chemistry and scientific research.

Overall, the specific form and grade of sodium tungstate that is best suited for a particular application will depend on factors such as the required purity level, intended use, and any specific performance requirements.

Sodium tungstate is commonly used in the production of pigments and dyes as a catalyst or precursor. Specifically, it can be used as a catalyst in the synthesis of indigo and other vat dyes. It can also be used as a precursor for producing yellow pigments, such as cadmium tungstate and zinc tungstate, which are used in ceramics, plastics, coatings, and textiles. Moreover, sodium tungstate can be employed as a mordant in dyeing processes to improve color fastness and enhance the affinity between the dye and the fabric.

Sodium tungstate (Na2WO4) can potentially be used as a substitute for other tungsten compounds in certain applications. This is due to its similar chemical properties and solubility in water, which make it suitable for use in applications such as ceramics, pigments, and catalysts. However, the specific suitability of sodium tungstate as a substitute depends on the particular application and performance requirements. Therefore, further research and testing may be necessary to determine its effectiveness as a replacement for other tungsten compounds in specific applications.

Exposure to sodium tungstate can have negative effects on living organisms. This compound has been shown to be toxic to bacteria, fungi, and plants at relatively low concentrations. In animals, exposure to sodium tungstate may cause neurological damage, reproductive problems, and changes in blood chemistry. Additionally, sodium tungstate has been identified as a potential carcinogen, meaning it may increase the risk of cancer development. Therefore, it is important to handle and dispose of sodium tungstate properly to minimize its impact on the environment and living organisms.