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[Chemical Knowledge]：Properties and Uses of Sodium Metabisulfite

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of properties and uses
of sodium metabisulfite in the field of chemical raw materials. Sodium metabisulfite (sodium Pyrosulfite, chemical formula Na2S2O5) is a common chemical raw material, widely used in chemical industry, food, medicine and other fields. In the field of chemical production raw materials, sodium metabisulfite has unique properties and uses. In this paper, the properties and uses of sodium metabisulfite are discussed in detail.

1. properties of sodium metabisulfite

1. physical properties: sodium metabisulfite is white or yellowish crystalline powder, pungent odor. It is easily soluble in water, and its solubility increases with increasing temperature. Insoluble in alcohol and ether and other organic solvents.
2. Chemical properties: sodium metabisulfite has strong reducibility and is easily oxidized into sodium sulfate. At the same time, it is also acidic and can react with alkali to form the corresponding salt. In addition, sodium metabisulfite also has good thermal stability.

2. sodium metabisulfite use

1. chemical raw materials: sodium metabisulfite can be used as chemical raw materials, used in the production of various chemicals. For example, it can react with acid to produce sulfur dioxide gas, which in turn is used to produce sulfuric acid, sodium hydrosulfite, etc. In addition, sodium metabisulfite can also be used in the production of rubber accelerators, dye intermediates, etc.
2. food additives: sodium metabisulfite can be used as food additives for food preservation, anti-oxidation and color protection. It can effectively inhibit the growth of microorganisms in food and extend the shelf life of food. At the same time, sodium metabisulfite can also prevent the oxidation of pigment discoloration in food and maintain the color of food.
3. Medical use: Sodium metabisulfite is also widely used in the field of medicine. It can be used as raw materials or excipients for the production of antibacterial drugs, antipyretic analgesics, etc. In addition, sodium metabisulfite can also be used to prepare medical devices and disinfectants.
Precautions for use of
3.

When using sodium metabisulfite, you need to pay attention to the following matters:

1. Storage: Sodium metabisulfite should be stored in a dry, cool, well-ventilated place, avoid direct sunlight and high temperature.
2. Operation: When operating sodium metabisulfite, wear protective gloves, goggles and other personal protective equipment to avoid contact with skin and eyes.
3. Dosage: When using sodium metabisulfite as a food additive, it should be used in strict accordance with the dosage prescribed by the state to ensure food safety.

In conclusion, sodium metabisulfite has unique properties and a wide range of uses in the field of raw materials for chemical production. Understanding the properties and uses of sodium metabisulfite is of great significance for rational utilization of resources and improvement of production efficiency. During use, relevant regulations and operating requirements should be followed to ensure safety and effectiveness.

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