3-Carboxy-4-Hydroxybenzenesulfonic Acid Dihydrate

Borax, also known as borax, its scientific name is sodium tetraborate dihydrate. This substance has a wide range of uses. In ancient times, its main uses were as follows:
- ** Medical field **: Borax has the effect of clearing away heat and detoxifying, and can be used to treat sore throat, mouth sores and other diseases. For example, in the "Compendium of Materia Medica": "Borax, sweet taste, slightly salty, cold in nature, non-toxic. It is used to treat swelling and pain in the throat, sores in the mouth and tongue, and blindness." Doctors often grind borax into a fine powder and blow it on the affected area to achieve the purpose of reducing swelling and pain, clearing away heat and astringent sores.
- ** Alchemy and Metallurgy **: In ancient alchemy, borax was often used as a flux. Because it can reduce the melting point of minerals, it makes ore more easy to melt, which is conducive to refining metals. In the metallurgical industry, borax can remove impurities on the surface of metals and improve the purity and quality of metals. "Tiangong Kaiwu" has a saying: "For casting mirrors, use gray sand for molding, tin and copper for copper, borax as a lead, and the melting is uniform."
- ** Daily life **: Borax can be used to make detergents. Because of its decontamination ability, the ancients often dissolved it in water to wash clothes, utensils, etc., to remove dirt. And borax can also make food more resilient and elastic. For example, when making certain pasta, adding a small amount of borax can make the pasta taste better. However, it should be noted that modern research shows that excessive intake of borax is harmful to the human body, and this usage is no longer recommended.

Borax, sodium tetraborate dihydrate, is a very important inorganic compound. Its physical properties are unique:
- ** Appearance **: Borax often appears as a colorless translucent crystal, or white crystalline powder, with a fine texture and a pure and white appearance. It is like the fine snow falling at the beginning of winter, giving people a sense of purity.
- ** Smell and Taste **: This substance has no special smell, but it tastes slightly salty and astringent, just like seawater touching the tip of the tongue, salty and astringent, with a unique taste.
- ** Solubility **: Borax has a unique solubility in water. It is easily soluble in water, just like snowflakes merging into a warm stream and quickly dissipating. And during the dissolution process, the water temperature has a significant impact on its solubility. The water temperature increases, and the solubility increases significantly.
- ** Density and Hardness **: Its density is moderate, and it feels slightly sinking. The hardness is relatively low, and it can be left behind by scratching it with a hard object, just like a soft wax block, showing the softness of its texture.
- ** Melting Point and Boiling Point **: Borax has a certain melting point. When heated to a specific temperature, it will melt into a liquid state, just like ice in the warm sun and turn into babbling water. However, due to its special properties, it usually decomposes before reaching the boiling point, making it difficult to see its boiling state.
- ** Stability **: Under normal conditions of normal temperature and pressure, borax is quite stable and can maintain its own shape and properties for a long time, just like a calm old man, unchanged over time. However, in a specific environment, such as the atmosphere of strong acid and alkali, its stability will be affected, chemical reactions will occur, and different chemical properties will be exhibited.

Fu 3 + -methyl-4-methoxybenzaldehyde dihydrate is a compound with specific properties. It has general chemical properties and plays an important role in the reaction and application of polymers.
In terms of physical properties of this compound, it often takes a specific crystal form or outer shape, and under normal conditions, or has certain melting and boiling properties. Its solubility is also an important property, and it can be soluble in some specific solutions. This property is due to its molecular properties and chemical properties.














< br The methoxy group is determined by the phase, but under some specific antibodies, it can also be reversed and affect the integrity of the molecule.
Furthermore, the aldehyde group (-CHO) is one of the important functional groups of this compound, and its chemical activity is very good. It can generate oxidation antibodies and oxidized carboxyl groups (-COOH) to form the acid compound of the phase. In addition, the aldehyde group can generate the reaction reaction of compounds containing amino groups (-NH2O) to form nitrogen-containing compounds.
The second hydrate form of this compound, the interaction of the main molecule of the water molecule also affects its chemical activity. Water molecules or other forces are the main molecular phase, and in some reactions, water molecules may affect the rate of reaction.
Therefore, the chemical properties of 3 + -group-4-methoxybenzaldehyde dihydrate are highly enriched. It is determined by the functional groups and hydrates contained in it. It has important research value in the fields of synthesis, physicochemical production, etc.

When storing 3 + -boron-4 -silylbenzaldehyde dihydrate, the following things should be paid attention to:
First, this compound is quite sensitive to humidity. Because its structure contains groups that can interact with water molecules, in a high-humidity environment, it may absorb water, causing its chemical composition and properties to change. Therefore, the storage place must be kept dry and can be placed in a dryer with suitable desiccants, such as anhydrous calcium chloride, silica gel, etc., to maintain the low humidity of the surrounding environment and ensure that the compound does not deteriorate due to moisture absorption.
Second, temperature control is also crucial. If the temperature is too high, it may cause the thermal movement of molecules to intensify, triggering chemical reactions such as decomposition and polymerization, which will damage the purity and structural stability of the compound. Generally speaking, it is recommended to store it in a low temperature environment, such as the refrigerator compartment, the temperature should be 2-8 ° C. However, it should also be noted that sudden changes in temperature may also have adverse effects on it, so large temperature fluctuations should be avoided during the transfer process.
Third, light will also affect 3 + -boron-4-silica-based benzaldehyde dihydrate. Under light, photochemical reactions may be induced, causing its structure to be damaged. Therefore, when storing, it should be placed in a dark place. It can be packed in a brown bottle or wrapped in a black packaging material to reduce the impact of light on it.
Fourth, this compound may have a certain chemical activity. When storing, it is necessary to avoid contact with active substances such as strong oxidizing agents and strong reducing agents. Because of its structure, boron and silicon groups may chemically react with these substances and change their chemical properties. It should be placed separately from other chemicals and clearly marked to prevent confusion and misuse to ensure the safety and stability of the storage process.

"Tiangong Kaiwu" discusses the manufacture of alum. There are many types of alum. In this paper, the production method of the hydrate of green alum and bile alum is described.
For green alum, the production method is often taken from iron-bearing ores. Choose iron-rich stones, crush them first, and make them into small pieces for subsequent processing. Put the crushed ore in a furnace and calcine them with fire. When calcining, the firepower needs to be uniform and long-lasting, so that all the things in the ore can fully react to the fire. When the ore is discolored, there is smoke coming out, which is a sign of the change of iron compounds.
After calcining, take it out and rinse it with water. The water and the ore are changed, and the iron sulfate is dissolved. Collect the leaching water, place it in a large kettle, and boil it over fire. When boiling, stir frequently to make it evenly heated. The water gradually evaporates, the solution gradually thickens, and it looks like crystals. Move the kettle to a cool place and let it cool naturally. After cooling, the crystals of green alum are precipitated at the bottom of the kettle, and it can be obtained by collection.
As for the alum, it often comes from copper-containing ores. When mining copper-containing ores, select them first, remove their impurities, and take those rich in copper. Break them into powder, put them in a cylinder, add dilute sulfuric acid and an appropriate amount of water. The sulfuric acid and the copper compounds in the copper ore should be combined to form a copper sulfate solution.
When the solution is finished, filter the solution to remove its insoluble matter. The filtrate is then put into the kettle, and During the process, closely observe its changes. When there is a crystal film on the surface of the solution, cease fire. Let it stand and allow it to cool slowly, and the bile alum crystals gradually emerge. This crystal is exquisite and has a blue color like blue. If taken, it is the bile alum dihydrate.
Although the preparation methods of the two are different, they both depend on the understanding of physical properties and the good control of heat and materials. Workers can obtain these two substances by following the ancient method and fine operation. They are useful in many things such as industry and medicinal use.