Diammonium Titanium Hexafluoride

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, and it is a detailed account of traditional agricultural and handicraft skills. Today, Ru asked "Liuhe alum (Liuhe alum dipotassium diacid, suspected to be potassium aluminum sulfate, that is, alum, chemical expression $KAl (SO_ {4}) _ {2} $) " The main use of alum, answered in classical Chinese.
Alum has a wide range of uses, and it is particularly important for water purification. In ancient times, pure water often encountered the difficulty of drinking water. It was found that alum was thrown into muddy water, which hydrolyzed in water and produced an aluminum hydroxide colloid. This colloid has adsorption properties and can collect impurities in the water to make the water clear for drinking, irrigation, etc.
In addition, in papermaking, alum also has a wonderful use. Paper production requires sizing to prevent ink smudging. Alum and vegetable glue can form a protective film on the surface of the paper, making writing and painting smoother, clear ink color, and can enhance the durability of paper, so that books and documents can be preserved for a long time.
In the field of food processing, alum can also be seen. In the past, when making fried pasta such as fried dough sticks, alum was often added. It reacts with baking soda to produce carbon dioxide gas, which makes the pasta swollen and soft, and the taste is better. However, due to the aluminum element in alum, excessive intake is harmful to health, and the use in food has been strictly restricted.
In addition, in the printing and dyeing industry, alum can be used as a mordant. When dyeing fabrics, alum is combined with dyes to help the dyes better adhere to the fabric fibers, making the dyeing firm, bright in color, not easy to fade, and improving the quality and aesthetics of fabrics.
In summary, alum has played an important role in many fields such as water purification, papermaking, food processing, printing and dyeing. Although some uses have changed today, its achievements in production and life in the past are indelible.

Alum is a chemical substance, and copper sulfate pentahydrate is also a unique and widely used. The physical and chemical properties of alum, let me elaborate.
Looking at its physical properties, copper sulfate pentahydrate is in the shape of blue crystals, its color is blue, just like the color of the deep sea, dazzling and quite beautiful. Hard and brittle, it feels cool to the touch. It is easily soluble in water, and melts when it enters water. The solution is blue, clear and transparent, like the liquid of a gem. And it has a certain density. When placed in water, it has a sinking state.
As for chemical properties, copper sulfate pentahydrate decomposes when heated. If it is burned by fire, the crystal gradually loses its crystalline water and turns from blue to white, which is the appearance of water loss. Its aqueous solution is acidic, due to the hydrolysis of copper ions. It can react with many substances, such as with active metals, iron, zinc, etc. Iron enters the solution, and red substances precipitate on the surface of iron. This is a displacement reaction. Iron replaces copper from its salt solution, which shows its chemically active nature.
It can also react with alkali. In case of sodium hydroxide solution, that is, a blue flocculent precipitation. This precipitation is copper hydroxide. This reaction is often used to test the presence of copper ions. Copper sulfate pentahydrate is widely used in many fields. It can be used as a fungicide in agriculture to protect crops from diseases. In the chemical industry, it is an important raw material for the preparation of other copper-containing compounds.
Copper sulfate pentahydrate has unique physical and chemical properties and is widely used in the world. It is actually an important existence of chemical substances.

The method of sulfuric acid pentahydrate is to start with sulfuric acid. The inverse formula is as follows:
\ [Cu + 2H_ {2} SO_ {4} () \ stackrel {\ Delta }{=\!=\!=} CuSO_ {4} + SO_ {2}\ uparrow + 2H_ {2} O\]
In this inverse, sulfuric acid generates sulfuric acid, sulfur dioxide and water under the addition of sulfuric acid. However, this method is deficient, so sulfur dioxide is harmful and pollutes the environment.
There are other methods, you can first add in the air, so that the formation of oxidation, the reverse is as follows:
\ [2Cu + O_ {2}\ stackrel {\ Delta }{=\!=\!=} 2Cu O\]
and the oxidation dilute sulfuric acid reverse, can be obtained sulfuric acid solution, reverse formula:
\ [CuO + H_ {2} SO_ {4 }=\!=\!= CuSO_ {4} + H_ {2} O\]
to be obtained sulfuric acid solution, which add, until the crystalline film out, stop adding, cold crystal, then obtained sulfuric acid pentahydrate crystal. In this way, the pre-phase method is more secure, because it is harmful to the emission of sulfur dioxide.
There are other ways to solve it. Use this method as the solution, graphite as the solution, and sulfuric acid as the solution. Through this method, the lost particles are formed into particles into the solution, and the particles are generated and escaped. In the solution, the particles are combined with sulfuric acid, crystals, etc., and sulfuric acid pentahydrate can also be obtained. Its inverse formula is:
\ [Cu - 2e ^{-}=\!=\!= Cu ^ {2 + }\]
The inverse formula is:
\ [2H ^ {+} + 2e ^{-}=\!=\! = H_ {2}\ uparrow\]

Dipotassium hexacyanoferrate, commonly known as yellow blood salt, is of paramount importance during storage and transportation.
Its properties are relatively stable, but it is easy to decompose when heated. Therefore, when storing, it should be placed in a cool and ventilated warehouse, away from fire and heat sources, to prevent it from decomposing due to excessive temperature, releasing toxic gases and endangering the surrounding area. And it needs to be stored and transported with oxidants and acids, because acids meet with it or react chemically, resulting in highly toxic hydrogen cyanide gas; oxidants can also react with it, affecting its stability and causing danger.
During transportation, make sure that the container does not leak, collapse, fall, or damage. The transport vehicle should be equipped with the corresponding variety and quantity of fire fighting equipment and leakage emergency treatment equipment. In summer, it should be transported in the morning and evening to avoid its high temperature period and prevent the decomposition of yellow blood salts under high temperature. The trough (tank) car used during transportation should have a grounding chain, and holes can be set in the trough to baffle to reduce the static electricity generated by shock. Due to static electricity or cause unexpected reactions.
The loading and unloading process must also be carried out with caution. Operators should wear appropriate protective equipment, such as gas masks, rubber gloves, etc., to avoid direct contact. Light loading and light unloading, do not drop and heavy pressure, so as not to damage the packaging and cause the leakage of yellow blood salts. If a leak unfortunately occurs, personnel from the leaked contaminated area should be quickly evacuated to a safe area, and quarantined to strictly restrict Emergency responders must wear self-contained positive pressure breathing apparatus, wear anti-toxic clothing, and do not let leaks come into contact with combustible substances (such as wood, paper, oil, etc.). In the event of a small leak, collect it in a dry, clean, covered container with a clean shovel; in the event of a large leak, build a embankment or dig a pit for containment, cover it with foam to reduce steam hazards, and then collect, recycle or transport it to a waste treatment site for disposal.

The era involved in "Tiangong Kaiwu" is a long time ago, and there was no knowledge of such substances as "dipotassium hexacyanoferrate" at that time. Therefore, the following is a virtual explanation in a style similar to ancient Chinese, only to explore its possible impact from a traditional perspective:
There is a thing today, called dipotassium hexacyanoferrate. This materiality, if it is between heaven and earth, may have a subtle response. In mountains, rivers and water, if it is accidentally distributed, the water may change gradually. Water, the root of all things, and its nature changes, all organisms in the water, from fish, shrimp, insects and algae, are affected by it. Fish and shrimp may be weak because of this, algae and grass may be abnormal, and the order of water ecology is chaotic.
As for the land, infiltrate into the soil, or change the quality of the soil. The soil is suitable for the growth of all things, and the texture is changed. The grains, vegetables and fruits planted may vary in length. Or the seedlings are not prosperous, or the fruit is not strong enough, and the business of farming mulberry will be impacted.
If it is related to the human body, this substance touches it, smells it, or enters the body, which may damage the qi, blood and meridians. The human body depends on the smooth flow of qi and blood, and the meridians and meridians are smooth. Once disturbed, the light person feels unwell and tired; in the serious case, it may cause the viscera to disobey, and the disease is rife. The eyes may be dim, the ears or deaf, the limbs are sour and soft, and the diet is tasteless And if you are exposed to this qi for a long time, its harm will gradually accumulate, and it may become a serious disease, which can be cured by extraordinary medicinal stones.
However, all things in heaven and earth can grow and overcome each other, or there are other things that can make this dipotassium hexacyanoferrate harm. But it is necessary to clearly observe the physical properties, do a good job of exploring, and use the law of nature to turn its harm into profit, to protect the peace of heaven and earth, and to protect the health of the human body.