4-Pyridinecarboxylic acid, 3-bromo-

The acid of boron is weakly acidic. In water, it does not completely dissociate like a strong electrolyte, but because of the special electronic structure of the outer layer of boron atoms, it interacts with water molecules to form coordination bonds, and then produces a small amount of hydrogen ions, so it is weakly acidic.
Boric acid also has certain oxidizing properties. When encountering strong reducing agents, the valence state of boron can be reduced. If it reacts with active metals, boric acid can obtain electrons, so that the metal oxidizes and itself is reduced.
Its solubility is also an important property. The solubility of boric acid in water increases with increasing temperature. At room temperature, the solubility is limited, but when heated and heated, more boric acid can be dissolved in water. This property is quite critical in many chemical processes and experimental operations. < Br >
And boric acid has a certain stability. Under normal conditions, it is not easy to decompose, and when it encounters high temperature or the action of specific strong chemical reagents, its structure may be damaged and chemical changes such as decomposition reaction occur.
And boric acid and alcohols can undergo esterification reaction. Under appropriate catalyst and reaction conditions, boric acid can form borate esters with alcohols, and this reaction has specific applications in organic synthesis and other fields. In short, boric acid has diverse chemical properties and has important uses in many fields such as chemical industry, medicine, and materials.

Borax has a sweet, salty taste and a cold nature. It is a commonly used medicinal stone. It has many functions in the way of medicine. It can clear away heat and detoxify, and treat the swelling and pain of the throat. The throat is the gateway to the lungs and stomach. If it is invaded by heat poison, it is red, swollen and painful, and borax can often play work. With its cool and moist properties, it can relieve the heat of the lungs and stomach, reduce swelling and pain, and make the throat unobstructed.
It can also prevent corrosion and build muscle, and treat the disease of non-convergence after sores and ulcers. If sores are damaged, it is easy to be attacked by external evil, and the carrion does not go, and new meat is difficult to grow. Borax can dissolve carrion, promote the growth of new meat, help wounds heal, and make the skin return to good condition. < Br >
It is also indispensable in industrial processes. In the glass manufacturing industry, borax can increase the transparency and heat resistance of glass. The quality of glass is easy to crack, and it is easy to deform when heated. Adding borax can improve its physical properties, make the glass tough and heat-resistant, and is widely used in the production of various heat-resistant glass products, such as glass instruments used in laboratories, heat-resistant glassware in kitchens, etc.
In the enamel industry, borax can be used as a flux. For enamels, the enamel needs to be firmly attached to the metal surface. Borax can reduce the melting point of the enamel, promote its uniform melting, make the enamel and the metal substrate more tightly, improve the quality of the enamel products, make the surface smooth, bright color, and durable.
Furthermore, in the field of metallurgy, borax can be used as a flux. When ore is smelted, borax can combine with impurities in the ore to form slag, thereby separating pure metals. This effect can improve the purity of metals, which greatly helps to improve the quality of metal smelting, and is widely used in many metal smelting processes.

The method of making caramel has been known in ancient times. The method is as follows:
Take the barley first, choose the plump one, soak it in water, and make it tiller. When the buds grow as long as the leeks, they will come out, dry, pounded, and set aside.
Take the glutinous rice again, wash it clean, and soak it in water until the rice can be crushed. Drain it, cook it in a retort, cook it until the rice is cooked like mud, take it out, and spread it in a large basin.
Wait for the rice to be slightly cold, sprinkle the crushed malt into the rice in proportion, and mix well. Cover it with a damp cloth and let it ferment. Pay attention to the temperature in this process, and do not overheat or overcool.
When the fermentation is completed, the juice in the rice can be seen seeping. Take a clean pot, pour in the rice and juice, add an appropriate amount of water, and cook slowly over low heat. Keep stirring during this time to prevent burnt.
Boil until the juice is thick and golden in color, and the caramel is formed. At this time, scoop up with a spoon, and the sugar liquid can hang down in a silk shape, which is the right heat.
The caramel made is sweet but not greasy. It can be seasoned for all kinds of delicacies, and it can also be used for children to satisfy their cravings. It adds a lot to the diet.

There is a question about the price of acetic acid in the market today. Acetic acid is useful in industry, medicine, and food, so its price varies with quality, quantity, time, and place.
If you ask for it in the market, the price of pure acetic acid is about tens of dollars per liter. However, if its quality is not pure, or if there are impurities, the price is slightly reduced, or only more than ten dollars per liter.
As for refined and pure acetic acid, used in medicine and scientific research, the price is very high. In terms of quantity, it may cost tens of gold per hundred milliliters, which is very demanding because of its manufacturing essence.
And the market price changes at any time. In a good year, if raw materials are sufficient, the price may drop; in a disaster year, if raw materials are scarce, the price will rise. And the distance of the land is also related to the price. In a place near production, the price must be cheap; in a place far away, the price will increase due to transportation.
Therefore, if you want to know the exact price of acetic acid, you can only get it when you carefully observe its quality, measure its time, and examine its place.

Borax and boric acid are stored and stored in the environment, and it is advisable to pay attention to all kinds of things. Borax, the nature is fixed, and it is easy to be damaged in the event of tide. Therefore, when it is stored in the environment, it is necessary to avoid the dryness of the atmosphere and the passage of the atmosphere. Boric acid is also stored in the dryness of the atmosphere to prevent it from being affected by the influence of the product.
The borax and boric acid are all properly packed. Borax is often used in bags, but the mouth of the bag must be packed to prevent the risk of leakage on the way. The boric acid package is also dense, and suitable containers can be used to prevent it from breaking the outside.
Furthermore, neither of the two can be mixed or mixed with acid. Borax is easy to react when it encounters acid, and boric acid will also be transformed when it meets, which may cause its products to be damaged or even dangerous.
In addition, borax and boric acid are not edible. They should not be placed with food to prevent food consumption. Workers should also take precautions. If they are accidentally connected, they should be washed with water. In addition, pay attention to general matters to ensure the safety of borax and boric acid in storage and packaging.