5-bromo-3-pyridine carboxlic acid

Borax, also known as borax, is a common mineral traditional Chinese medicine. Its main uses are quite extensive, and are described as follows:
First, it has high medicinal value. Borax is sweet and salty, cold in nature, and belongs to the lungs and stomach meridians. It has the effect of clearing away heat and detoxifying, and is often used for swelling and pain in the throat, sores on the mouth and tongue, and red-eyed obstruction. For example, the classic Bingboron powder is based on borax as the main medicine, which is compatible with borneol, cinnabar, and Xuanming powder. It can clear away heat and reduce swelling, astringent sores and build muscles, and has a significant effect on throat pain, gum swelling and sores on the mouth and tongue caused by heat and poison accumulation. And because it has antiseptic power, it can be used externally to treat skin sores and ulcers that do not converge
Second, it is widely used in the industrial field. In the glass industry, borax can enhance the thermal stability and transparency of glass, reduce the coefficient of expansion of glass, and is widely used in the manufacture of optical glass, heat-resistant glass, etc. In the ceramic industry, borax can be used as a flux to reduce the firing temperature of ceramics, improve the gloss and hardness of ceramics, and improve the properties of ceramics. In the production of enamel, borax helps to melt the enamel, improve the bonding force between the enamel and the metal, and make the enamel products more durable and beautiful.
Third, it is also used in other fields. In food processing, borax was used to increase the toughness, brittleness, and preservative preservation of food in the past. However, due to its toxicity, it is now strictly prohibited from being added to food. In the field of agriculture, borax can be used as a trace element fertilizer to supplement boron for plants, promote plant growth and development, and improve crop yield and quality. In detergents, borax can be used as an auxiliary agent to enhance the decontamination ability of detergents, and at the same time, it has a certain sterilization and disinfection effect.
Although borax has many uses, it must follow relevant regulations and standards when using it, especially in areas involving human health, it is necessary to be cautious to prevent damage to the human body.

Borax, an important compound of boron, is also a common boron-containing mineral. It has many unique physical properties and is widely used in many fields.
Borax is usually colorless and translucent crystals or white crystalline powder. Its texture is relatively soft, with a Mohs hardness of about 2-2.5 and a relative density of about 1.73. Borax can be slowly weathered in air and is easily soluble in water. Its aqueous solution is alkaline.
The stability of borax crystal water varies with temperature. When heated, borax will gradually lose its crystal water. At about 60 ° C, it loses its octet crystal water; at about 320 ° C, the crystal water is completely lost and converted into anhydrous borax. Anhydrous borax is further heated and melts into a glassy substance. This property is crucial in metallurgy, glass manufacturing and other industries.
The solubility of borax is also a significant physical property. In hot water, borax has a high solubility; in cold water, it has a relatively low solubility. This property makes it applicable in some application scenarios where the dissolution rate or concentration needs to be controlled.
In addition, borax crystals have certain optical properties. Objects observed through borax crystals will exhibit birefringence, which is used in optical instruments and some special materials research fields.
Borax plays an important role in industry, agriculture, medicine and daily life. Its physical properties determine its wide range of uses and contribute significantly to the development of human society.

To make boric acid, there are various wonderful methods. First, borax and sulfuric acid are prepared. Borax is a common borate, and reacts when it encounters sulfuric acid. The reason for the reaction is that borax ($Na_2B_4O_7\ cdot10H_2O $) meets sulfuric acid ($H_2SO_4 $), and the hydrogen ion of sulfuric acid is active. It combines with the oxygen atom in borax, so that the borax structure disintegrates. Boron in borax is free and recombined with sulfate ions to form boric acid ($H_3BO_3 $) and sodium sulfate ($Na_2SO_4 $). The chemical formula is as follows: $Na_2B_4O_7\ cdot10H_2O + H_2SO_4\ longrightarrow 4H_3BO_3 + Na_2SO_4 + 5H_2O $. This method is easy to obtain raw materials and the reaction is relatively smooth, which can be used in ordinary workshops.
Second, it is prepared by combining boromignetite with sulfuric acid. Boromignetite ($Mg_2B_2O_5\ cdot H_2O $) is a boron-containing ore, which can also produce boric acid when interacted with sulfuric acid. In boromignetite, magnesium is combined with sulfate to form magnesium sulfate ($MgSO_4 $), and boron is converted to boric acid. The reaction formula is: $Mg_2B_2O_5\ cdot H_2O + 2H_2SO_4\ longrightarrow 2H_3BO_3 + 2MgSO_4 $. This method requires first boromignetite, but the mining and refining of ore also requires effort. If there is a mineral source, it is also a good way to produce boric acid.
Third, boron trioxide is combined with water. Diboron trioxide ($B_2O_3 $) is an oxide of boron, which reacts slowly in contact with water to form boric acid. Although this reaction is simple, it is not easy to produce boron trioxide, and it is often necessary to prepare this substance by other methods. Therefore, in practical applications, it is not as common as the previous two. The reaction formula is: $B_2O_3 + 3H_2O\ longrightarrow 2H_3BO_3 $.
These are all methods for preparing boric acid. Each has its advantages and disadvantages. It needs to be used according to the actual situation, such as the availability of raw materials, the cost, and the difficulty of the process.

In today's world, the price of mercury and boron is widely studied. Mercury is spiritual and widely used, and is involved in medicine and alchemy. For boron, its salts are also needed by various industries, so the change in its price is related to all industries.
In various cities, the price of mercury often changes due to sources and requirements. If the source of minerals is abundant, and it is easy to mine, the price will be flat; if the source is scarce and there are many people seeking it, the price will rise. In recent years, environmental protection regulations have become stricter, and mercury mining is limited, so its price has risen. As for borate, it also changes with the needs of industry, agriculture, medicine and other industries. In industry and prosperity, more materials are used, and the price is also high; if the agricultural work slows down and the demand decreases, the price may drop.
Looking at the past years, the price of mercury fluctuates under the changes in supply and demand and the regulations of the government. Borate also moves according to the demand of the market and the amount of production. Moreover, in the international market, changes in exchange rates and trade policies are all related to the price of mercury and borate.
If you want to know the exact price today, you can visit the market, look at the number of exchanges, or consult the industry. However, the market is not constant, and the price is also changeable. Only by constantly looking at the situation and taking the change can you know the market price of mercury and borate.

Mercury and arsenic are both poisonous and need to be treated with caution. Mercury is a liquid gold, which is toxic due to its evaporation. For storage, a dense container must be used to prevent external leakage. Containers need to be corrosion-resistant, because mercury can cause the reaction of many substances. And it is appropriate to store in a container, through a fire source, in order to reduce the rate. It is also necessary to keep the container dense, shock-proof and anti-collision, so as not to cause mercury to be released due to the failure of the container. Once it leaks, the mercury beads will quickly disperse and be collected, and their evaporation will be in the air, which is very harmful.
Arsenic is solid, and often compounds are also toxic. It is stored in the dry world, because some arsenic compounds can react in contact with water, or dissolve harmful substances. It is also necessary to use a dense container to prevent powder from escaping. In the process, it is necessary to avoid package breakage and cause arsenic powder to disperse. And arsenic compounds have different shapes, so it is necessary to follow the chapter on dangerous products according to their characteristics.
Therefore, mercury and arsenic should be stored and destroyed, and they should be operated safely. People need to be trained before operation, and they are familiar with the hazards and emergency management. If not, both leaks will seriously pollute the environment, endangering life and health.