What are the main uses of Tin II Fluoride?
Tin (II) Fluoride is stannous fluoride, and its main use is quite extensive.
Stannous fluoride has a significant effect in the field of dentistry. In ancient times, although there was no such accurate chemical understanding as modern times, there was also a search for oral health care. If the ancients knew about stannous fluoride, they would have cherished its ability to protect teeth. Today, it is often added to toothpaste. By reacting with the surface of the teeth, a protective film is formed. This film can effectively block the erosion of acidic substances on the teeth, thereby preventing the growth of dental caries. Although the ancients did not know its chemical principle, they pursued dental health consistently. If they can obtain this substance, it may be a treasure to protect the teeth.
In addition, tin fluoride is also useful in some special metal surface treatment processes. In ancient times, metal utensils were crucial in life. If the ancients could master the method of treating metal surfaces with tin fluoride, metal utensils could be made more durable. Tin fluoride can react with the metal surface to form a dense protective layer, which can resist the corrosion of the external environment and prolong the service life of metal utensils. In this way, there is no need to replace metal utensils frequently, which saves resources and allows precious metal products to be preserved for a long time.
At the same time, tin fluoride can act as a catalyst in some specific chemical synthesis reactions. Although the ancient chemical synthesis was far less developed than modern times, if stannous fluoride could be used as a catalyst in some simple material preparation processes, the reaction process could be accelerated and the production efficiency of the product could be improved. This was undoubtedly a great help for the limited material preparation technology at that time, which could provide the ancients with more kinds of substances to meet the diverse needs of life.
Effects of Tin II Fluoride on the Human Body
The author of "Tiangong Kaiwu", written by Yingxing in the Ming and Song Dynasties, is a collection of the great achievements of the technology at that time, but the book does not mention the effects of Tin (II) Fluoride on the human body. Try to say it in ancient Chinese to answer this question.
Stannous fluoride is also a chemical. In today's world, it is often included in toothpaste. People use toothpaste containing this, which is beneficial to the teeth. Cover tin fluoride can strengthen the teeth and prevent the growth of tooth caries. With its ability to combine with the surface of the teeth, it forms a strong and acid-resistant layer to resist the erosion of acid, so the teeth can be protected.
However, if the human body takes too much tin fluoride, it will also suffer. It may hurt the bones of the human body. The metabolism of calcium and phosphorus in the bone is chaotic because of it. The density of the bone decreases, and it is brittle and easy to break. Or damage the nerves of the human body. The nerve conduction can change, and people may feel numbness and pain, and the movement of the limbs or inconvenience.
And if tin fluoride enters the eyes, it can cause eye injuries. The eyes are red, swollen, painful, and the vision is not clear. If taken by mistake, the stomach will suffer from it. The symptoms of vomiting and diarrhea, abdominal colic, people are miserable.
Therefore, when using things containing tin fluoride, you should abide by the law and do not use too much, so that you can enjoy its benefits and avoid its harm.
What are the precautions for Tin II Fluoride in the production process?
"Tiangong Kaiwu" on tin refining to fluoride, in the manufacturing process, several important items must be paid attention to.
First of all, the raw material, tin ore must be selected, and impurities will damage the quality of the product. The ore or other substances, such as iron, copper, etc., must be removed first to obtain pure tin. And the method of mineral processing should make good use of physical and chemical techniques, such as re-selection, flotation, etc., to ensure that the grade of tin is high.
As for the method of reaction, tin and hydrofluoric acid are used to produce stannous fluoride, and the reaction conditions are essential. The temperature must be controlled at a suitable degree. If it is too high temperature, the reaction will be too fast, which is difficult to control and easy to cause side reactions; if the temperature is low, the reaction will be slow and time-consuming. It is usually appropriate to be moderately warm to make the reaction proceed smoothly. The pressure should not be ignored. Under normal pressure, some reactions may be difficult to proceed smoothly, or micro-pressure is required to help the reaction direction.
Furthermore, the reaction device must be acid-resistant. Hydrofluoric acid is highly corrosive, so the container material is selected as an acid-resistant material, such as special glass, polytetrafluoroethylene, etc. And during the reaction process, it must be prevented from leaking, because it is toxic. If it escapes outside, it will hurt people and pollute the environment.
After the product is processed, after tin fluoride is made, it must be purified and refined. Impurities are stored in it, or their properties are changed, which is not suitable for application. Purification methods, or crystallization, filtration, distillation, etc., make the product high purity. The preservation of the finished product is also crucial. It should be placed in a sealed and dry place to avoid contact with water vapor and air to prevent oxidation and hydrolysis to ensure its quality stability.
How Does Tin II Fluoride React with Other Substances?
Tin (II) Fluoride is stannous fluoride, which is quite unique in various chemical reactions.
Stannous fluoride reacts when it encounters a strong acid, such as hydrochloric acid (HCl). It is in contact with hydrochloric acid and proceeds according to the following formula: $SnF_ {2} + 2HCl = SnCl_ {2} + 2HF $. In this reaction, tin ions in stannous fluoride are transposed with chloride ions, resulting in stannous chloride and hydrofluoric acid.
When it comes to strong oxidants, such as hydrogen peroxide ($H_ {2} O_ {2} $), it also changes. In acidic media, hydrogen peroxide can oxidize $Sn ^ {2 +} $to $Sn ^ {4 + }$ 。 The reaction is roughly as follows: $SnF_ {2} + H_ {2} O_ {2} + 2H ^ {+} = Sn ^ {4 +} + 2H_ {2} O + 2F ^{-}$ 。 In this process, $Sn ^ {2 +} $loses electrons, the valence state increases, and the oxygen in hydrogen peroxide gains electrons, and the valence state decreases.
meets the base and also reacts. Taking sodium hydroxide (NaOH) as an example, stannous hydroxide precipitate will initially form: $SnF_ {2} + 2NaOH = Sn (OH) _ {2}\ downarrow + 2NaF $. However, stannous hydroxide has amphoteric properties. If there is too much sodium hydroxide, the precipitate will dissolve again, resulting in sodium stannous acid: $Sn (OH) _ {2} + 2NaOH = Na_ {2} SnO_ {2} + 2H_ {2} O $.
And stannous fluoride is not completely stable in water. Because $Sn ^ {2 +} $will hydrolyze, the solution is acidic. The hydrolysis reaction can be expressed as: $Sn ^ {2 + } + 2H_ {2} O\ rightleftharpoons Sn (OH) _ {2} + 2H ^{+}$ 。 This state of hydrolysis is affected by many factors such as temperature and concentration.
If it encounters some metal salts, if the metal activity is weaker than tin, a displacement reaction will occur. If it meets with silver nitrate ($AgNO_ {3} $) solution, tin can replace silver: $SnF_ {2} + 2AgNO_ {3} = Sn (NO_ {3}) _ {2} + 2Ag $, the silver ion in the solution obtains electrons, and the silver element is precipitated.
What are the storage conditions for Tin II Fluoride?
Tin (II) Fluoride is stannous fluoride, and its storage conditions are very critical, which is related to the stability of its chemical properties and the maintenance of its efficacy.
Stannous fluoride should be stored in a dry place. Because of its certain hygroscopicity, if the environment is humid, it is easy to absorb water vapor, resulting in its own deliquescence, which in turn affects its purity and quality. And humid environment may cause it to chemically react with water, changing the original chemical structure and properties.
should be placed in a cool place to avoid heat. Excessive temperature will accelerate its chemical reaction rate, resulting in decomposition or deterioration. If at high temperature, stannous fluoride may react more violently with air components, shortening its effective shelf life.
also needs to be sealed and stored. Because stannous fluoride can interact with gases such as oxygen and carbon dioxide in the air. Sealing can reduce contact with these gases, prevent oxidation and other reactions, and ensure its chemical stability.
In addition, stannous fluoride should be stored away from fire sources and flammable substances. Although it is not a typical flammable substance, under some special conditions, it may be dangerous due to external factors. And it should be stored separately from other chemicals to avoid mutual reactions. If it cannot be co-stored with strong oxidants, strong acids, etc., to prevent uncontrollable chemical reactions, endangering storage safety and product quality. In this way, according to the above proper storage conditions, tin fluoride can be guaranteed to maintain good performance and quality for a long time.
