What is the main use of Barium fluoride white powder?

Barium fluoride white powder is widely used. In the art of alchemy, it is often used as a chemical aid. Ancient alchemists wanted to refine magic pills, so they relied on this powder to promote the sympathetic of medicinal stones and adjust the fire of pills.

In the industry of casting tools, it is also useful. It can be used as an auxiliary to the casting mold, making the casting mold solid and smooth, the shape of the casting vessel is beautiful and of good quality, and the pores of defects are reduced.

In medicine Materia Medica, or it is said to be used as medicine. However, it should be used with caution, because of its strong nature or toxicity. If used properly, it can treat some diseases and diseases. If used improperly, it may hurt people's righteousness.

In the preparation of color materials for calligraphy and painting, it is occasionally involved. It can make the color not fade for a long time, add the charm of the painting, and make the masterpieces of calligraphy and painting be handed down for a long time without changing the color.

Furthermore, there are traces in the vulgar letters of the house to ward off evil spirits. The ancients believed that it could exorcise evil spirits and protect the peace of the house due to its purity of white and the difference in material properties. It was often placed in a secret place in the house.

What are the physical properties of Barium fluoride white powder

The white powder formed by barium and fluoride has quite specific physical properties. This white powder, called barium fluoride, is solid at room temperature, white in color and pure in quality. It is like a fine powder and feels delicate to the touch.

Its density is larger than that of common light powders, about 4.89 g/cm ³. It feels quite sinking when placed in the hand. The melting point is quite high, up to 1353 ° C. It is not easy to melt in case of high temperature, and it is difficult to melt unless it is hot. The boiling point is 2260 ° C. In order to gasify it into steam, an extremely high temperature environment is required.

Barium fluoride has poor solubility in water and is insoluble. However, it can slowly dissolve in acid, which is its difference from water. Its crystal structure is unique, it is a cubic crystal system, and the crystal lattice is arranged in a regular and orderly manner, so the appearance is uniform.

Because of its physical properties, barium fluoride is widely used in the field of optics. Optical lenses can be made, because of their excellent performance of light refraction and transmission, they can make light propagate according to a specific path, and the image is clear. In the manufacture of scintillator materials, it is also indispensable. When excited by high-energy particles, it can emit flickering light, which is convenient for detecting particle traces.

Barium fluoride white powder

The white powder of barium fluoride, that is, barium fluoride (BaF 2), is prepared as follows:
First take barium hydroxide (Ba (OH) 2) and dissolve it in an appropriate amount of water to make a clear solution. This process needs to be handled carefully so that the barium hydroxide is fully dissolved without leaving residue.
Prepare hydrofluoric acid (HF) and slowly pour it into the prepared barium hydroxide solution. When pouring, add and stir to make the two fully react. The chemical equation of the reaction is: Ba (OH) 2 + 2HF = BaF 2 + 2H 2 O. In this reaction, barium hydroxide interacts with hydrofluoric acid to form barium fluoride and water.
After the reaction, the solution contains barium fluoride. However, this solution may contain impurities and must be filtered. Using a combination of filter paper and a funnel, the solution is slowly poured in, so that the impurities remain on the filter paper, and the pure barium fluoride solution flows down through the filter paper.
The filtrate is moved to an evaporation dish and heated over low heat to gradually evaporate the water. When heating, it is necessary to constantly stir to prevent local overheating from causing barium fluoride to splash out. When most of the water evaporates and more crystals precipitate, remove the fire source and use the residual heat to evaporate the remaining water to obtain a white barium fluoride powder.
In addition, barium carbonate (BaCO 🥰) can also be prepared by reacting with hydrofluoric acid. First place barium carbonate in a container and add hydrofluoric acid dropwise. The reaction equation is: BaCO < unk > + 2HF = BaF < unk > + H < unk > O + CO < unk > ↑. The reaction generates carbon dioxide gas to escape. After the reaction is completed, pure barium fluoride white powder can be obtained after filtration, evaporation and crystallization. When preparing, due to the strong corrosiveness of hydrofluoric acid, the operation must be carried out in a well-ventilated place, and protective equipment is required to ensure your own safety.

Barium fluoride white powder in storage need to pay attention to what

The white powder composed of barium and fluoride, that is, barium fluoride, needs to be paid attention to when storing.

First, moisture-proof is essential. Barium fluoride has a certain water absorption. If it is damp, it may change its properties and affect subsequent use. Therefore, when stored in a dry place, a desiccant can be prepared next to the storage container to keep the environment dry.

Second, the seal needs to be tight. This white powder should be placed in a well-sealed container to prevent contact with air components such as carbon dioxide, oxygen, etc. Because it may chemically react with these substances, its purity and quality will be damaged.

Third, temperature and light also need to be paid attention to. It should be avoided from high temperature environment. Under high temperature, barium fluoride may decompose and other reactions. And it should be prevented from direct light, because light may also cause some photochemical reactions and cause changes in properties.

Fourth, the storage place should be away from fire sources and flammable materials. Although barium fluoride itself is not flammable, the surrounding flammable materials catch fire, or affect its storage environment, causing danger.

Fifth, it needs to be stored separately from acids and other chemicals. Barium fluoride is easy to react with acids and generate dangerous substances such as hydrofluoric acid, so it cannot be stored together with acids.

Sixth, the logo must be clear. In a prominent place in the storage container, mark "barium fluoride" and related warning signs for others to identify and prevent accidental operation from causing safety accidents.

In short, proper storage of barium fluoride white powder requires attention to moisture resistance, sealing, temperature control, protection from light, away from sources of fire, flammable substances and acids, and clear identification to ensure its quality and safety.

What are the chemical properties of Barium fluoride white powder

The white powder formed by barium (Barium) and fluoride (fluoride) is barium fluoride (Barium Fluoride). It has many chemical properties, as detailed below:

Barium fluoride has high stability. Under normal temperature and pressure, it can exist stably and is not easy to spontaneously decompose. Due to the formation of strong ionic bonds between barium ions ($Ba ^ {2 +} $) and fluoride ions ($F ^ - $), the ionic bond energy is quite high, which makes the structure of barium fluoride stable.

Barium fluoride is slightly soluble in water. According to the law of solubility, many fluorides have different solubility, and barium fluoride is only slightly soluble. The dissolution process is a reversible equilibrium, $BaF_ {2} (s) \ rightleftharpoons Ba ^ {2 +} (aq) + 2F ^ - (aq) $, although the degree of dissolution is limited, under certain conditions, the solubility can be increased by the principle of equilibrium movement, such as changing the temperature, adding specific reagents to affect the ion concentration.

Barium fluoride has certain oxidizing and reducing properties. The + 2 valence of barium element is its common stable valence state and is usually difficult to be oxidized. However, when encountering extremely strong oxidizing agents, the theoretical valence may increase. The - 1 valence of fluorine is its lowest price state, and it is only reductive. However, fluorine ions are extremely weakly reducible. Due to the extreme electronegativity of fluorine atoms, they have strong binding force on electrons. In general, the oxidation and reduction properties of barium fluoride are not significant under common conditions.

Barium fluoride can react with acids. When encountering strong acids, $BaF_ {2} + 2H ^ +\ rightleftharpoons Ba ^ {2 + } + 2H F $to form barium salts and hydrofluoric acid. This reaction occurs according to the principle of strong acid to weak acid. The generated hydrofluoric acid has the characteristics of corrosiveness and volatility.

Barium fluoride under high temperature conditions, or physical and chemical transformations such as lattice structure changes occur. Although its chemical stability is good, high temperature energy can break some chemical bonds, cause lattice structure rearrangement, and affect its physical and chemical properties, such as color, density, etc.

In summary, barium fluoride white powder has chemical properties such as stability, specific solubility, limited redox, acid reactivity, and high temperature variability, and has important uses and research value in many fields.