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[Chemical Knowledge]：Properties and uses of potassium alum

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Potassium alum, also known as potassium aluminum sulfate, is a chemical substance with important properties in the field of chemical production raw materials. It has a colorless or white crystalline form and is very soluble in water. Potassium alum has a wide range of properties and uses, as will be described in detail below.

1. properties of potassium alum

1. physical properties: potassium alum is a colorless, transparent, large crystalline or granular powder, odorless, taste sweet and sour. It is stable in the air, but weathered in the sun. When heated to 200 ° C, all crystal water is lost as a white powder, that is, burned alum. Above 280°C, it decomposes to form alumina, sulfur oxides and water.

2. chemical properties: potassium alum soluble in water, insoluble in ethanol. Its aqueous solution is acidic and hydrolyzes in water to form a colloidal precipitate of aluminum hydroxide. In addition, potassium alum is also astringent and can be used as an astringent to treat conditions such as diarrhea and dysentery.

2. the use of potassium alum

1 water purification agent: potassium alum as a water purification agent in the field of water treatment has a wide range of applications. The principle is that potassium alum can ionize aluminum ions in water, and aluminum ions are easily hydrolyzed to generate aluminum hydroxide Al(OH)3 colloid. The adsorption capacity of aluminum hydroxide colloid is very strong, which can adsorb impurities suspended in water and form precipitation to clarify the water. Therefore, potassium alum is a good water purification agent.

2. fire extinguishing agent: potassium alum can be used as fire extinguishing agent. This is because the sulfur dioxide decomposed by potassium alum at high temperature can dilute the oxygen on the surface of the combustion substance, and the alumina decomposed by it can cover the surface of the combustion substance, which can reduce the temperature of the combustion substance, so as to achieve the effect of fire extinguishing.

3. medical use: potassium alum in medicine can be used as an astringent, such as used as a wet medicine, can be taken orally can be used externally, can treat jaundice, edema, excessive leucorrhea, diarrhea, mouth sores, eczema, scabies and other diseases.

4. food additives: potassium alum can also be used as a food additive for the production of pasta food.

In general, potassium alum has a wide range of properties and uses in the field of chemical production raw materials.

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