8-Hydroxyquinoline-5-sulfonic acid

Well, when it comes to boric acid, its chemical properties are really worth exploring. Boric acid, a white crystalline powder, has a slightly sour taste and a greasy touch.
Bear the brunt, boric acid is acidic, but its acidity is very weak, belonging to a monobasic weak acid. This is because boric acid in water does not ionize hydrogen ions by itself, but by combining with hydroxide in water molecules, which releases hydrogen ions. This process is very delicate, just like a secret layout. Reaction like this: $H_ {3} BO_ {3} + H_ {2} O\ rightleftharpoons [B (OH) _ {4 }]^{-}+ H ^{+}$ ， is the reason for its acidic nature.
Furthermore, boric acid is thermally stable. When heated, boric acid slowly loses water, first forming metaboric acid ($HBO_ {2} $), and then further dehydrating into boronic anhydride ($B_ {2} O_ {3} $). Just like the phoenix nirvana, after different stages of change, the morphology and properties also change.
In addition, when boric acid meets alcohol, a wonderful reaction occurs, forming borate esters. Under the catalysis of concentrated sulfuric acid, boric acid and methanol are heated together, resulting in the formation of trimethyl borate. This process is like a wonderful chemical dance, where the molecules are intertwined and the song of co-spectral reaction is intertwined. < Br >
The solubility of boric acid in water also has its own characteristics, and its solubility increases with the increase of temperature. Just like the ice of winter, it gradually melts in the warm sun, and the change of temperature affects the degree of solubility of boric acid in water.
The chemical properties of boric acid are diverse and unique, and it is very useful in many fields. In chemical industry, medicine, agriculture and many other fields, it is like a hidden silk thread, which plays an indispensable role in different applications in series.

Good, you ask. The open fire of the flintlock has made great contributions in the ancient world. There are three uses for it. One is cooked food, the other is to keep out the cold, and the third is to drive away beasts.
The ancient people drank blood from the raw hair, and there were many diseases in the stomach. Since the flutters drilled wood for fire, they began to get cooked food. Grain meat and fruit are cooked over fire, which is delicious and easy to digest. The diseases of the people are less and less, and the body is also strong. This is the great work of the flintlock fire in diet.
As for keeping out the cold, every autumn and winter, the sky is cold and the wind is biting. If there is fire, it is warm. Sitting around the fire, the warmth melts. It can avoid the cold of frost and snow, and protect the body. This is also the power of fire.
It also has the ability to drive away beasts. In the mountains and forests, beasts run rampant, disturbing the safety of the people. However, beasts are afraid of fire, and they burn fire around their dwellings. Beasts dare not approach, and the people will be at peace. The power of flintlock fire to protect the people is indispensable.
And cheese is a drink fermented from grains and fruits. There are two main uses. One is sacrifice. The ancient ancestors, who feared the sky and feared the gods, used cheese as an offering during sacrifice, expressing the heart of worshiping the gods, praying for the blessing of the gods, hoping that the weather would be smooth and the grains would be abundant. The second is drinking. Cheese is sweet, and drinking it in moderation can quench thirst and refresh the mind. In the spare time, drinking this wine, fatigue a little relief, physical and mental comfort.
In summary, the fire is related to the people's diet, cold and warm, and safety; Li cheese is used for worship and daily drinking, both of which were essential to the people's livelihood in ancient times.

As mentioned in the "Heavenly Works", the first step in making a mud is to take the peel, put it in the lime peel, soak it in a pond, and then take it out after a few days. The soaking also makes the peel melted and easy to make.
When it comes out, steam it in a kettle until it is cooked. When it is cooked, it becomes a mud, and the mud is ready. Put it in a tank and mix it with water to disperse it evenly, such as milk.
Then, take it from the peel, it is as dense as the peel, attached to the peel, and under the water. The top of the peel, the thickness is uniform, the shape of the peel.
Then, when it is attached, it is turned upside down on the wooden board, and it is removed, and it is left on the board. Then cover it with other boards, and add more, and use heavy objects to produce water, so that it can be dried.
It is too urgent and easy to crack, and it is too difficult. When it is dry, it will be completed.
In this way, the steps of soaking the skin, steaming the material, pounding, making, copying, water, and drying are completed. This method has been passed down from generation to generation, and it will not be changed. However, its basic principle is roughly the same, so it has become the work of our company, which has lasted for a long time, and has benefited the world.

When the alum-based fire and the sulfuric acid are transported in Tibet, everyone should pay attention.
The alum-based fire is strong in nature, and the heat should be carefully checked when using it. If the fire is too much, the alum-based fire may damage its properties and cause it to be ineffective. And the control of fire is about precision, and it needs to be adjusted appropriately according to the amount of alum-based fire and the situation in which it is located. Excessive fire may cause the alum-based fire to mutate and lose its original use; if the fire is not enough, the alum-based fire cannot be fully transformed, and it is difficult to recover the full work.
As for the sulfuric acid, when it is hidden, the environment is the first priority. It is advisable to choose a cool and dry place to avoid direct sunlight to prevent it from changing due to heat. And it is easy to merge with other things, so the hiding place needs to be clean, so do not let the impurity gas invade it, and do not put it in the same place with the other things. Otherwise, it may cause the qualitative change of the acid, which will damage its original nature.
When transporting the acid, protection is indispensable. Because it is corrosive, if it touches the skin inadvertently, it will cause damage. Therefore, the person who handles it should be in front of protective equipment, such as leather gloves and thick cloth clothes, and behave firmly, and do not let the acid pour.
In addition, when the alum-based square fire and the acid are transported in Tibet, special personnel are required to take care of it. The director must be familiar with its nature, understand its advisability and taboos, and be able to deal with it calmly in case of changes. There should be clear records of the hiding place and the transportation route. When it was hidden, when it was transported, and what its condition was, it should be detailed one by one for future investigation.
In general, when the alum-based fire and the sulfuric acid are transported in Tibet, the inspection of the heat, the selection of the hiding place, the preparation of protection, the person in charge of the affairs and the details of the records are all matters of great importance, and must not be ignored, so that the smooth operation of the collection and transportation can be preserved and used to the best of their ability without fear.

The price of alum in Guanfu City has not been exact in the past, but it fluctuates with the passage of time and the change of supply and demand. I have heard that in the past, the price of alum was between eight and ten texts per catty.
The price of alum is widely used, and it is very useful in printing and dyeing and tanning. It is also related to the rise and fall of various industries based on its price. However, its price is not static. If the goods are sufficient in a prosperous year, the price will drop slightly; if the goods are scarce in an age, the price will rise. And the price is slightly different in the four places. The price may be slightly cheaper in the vicinity of the place of origin, and more expensive in the distance.
As for the price of stone alkali, it is also uncertain in the market. Depending on the situation, the price per catty is about between five and seven texts. The use of stone alkali is also indispensable for washing and cooking. The change in its price is also affected by the weather, geographical location, and man-made things. If the weather is smooth and the output is abundant, the price will be stable and flat; if the output is damaged in the event of disasters, the price will rise. And the difficulty of business and transportation of merchants is related to the price.
However, these are all approximate numbers. The market conditions are fickle, and it is difficult to determine them all. If you want to know the exact price, you must go to the market in person and ask the merchants before you can get it.