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[Chemical Knowledge]：Properties and Uses of Sodium Nitrite

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Sodium nitrite is an inorganic compound with a chemical formula of NaNO2, which has strong oxidizing and reducing properties. In the field of chemical production raw materials, sodium nitrite is widely used in many aspects, this paper will introduce the nature and use of sodium nitrite in detail.

1. the nature of sodium nitrite

1. physical properties
sodium nitrite is white or yellowish crystalline powder, hygroscopic, soluble in water, slightly soluble in ethanol, methanol, ether and other organic solvents. Its aqueous solution is alkaline, pH value is about 9.
2. Chemical properties
sodium nitrite has strong oxidizing and reducing properties, and can react with many substances. In the air, sodium nitrite will gradually decompose to produce sodium nitrate and nitric oxide. In addition, sodium nitrite is also corrosive and has a certain corrosive effect on metals.

2. the use of sodium nitrite

1. chemical production
in chemical production, sodium nitrite can be used as an oxidant, reducing agent, catalyst and so on. For example, sodium nitrite can be used as a raw material for the production of dye intermediates for the production of azo dyes. In addition, sodium nitrite can also be used in the production of preservatives, plasticizers and other chemicals.
2. Pharmaceutical manufacturing
Sodium nitrite can be used as raw materials in pharmaceutical manufacturing for the production of antibacterial drugs, anti-tumor drugs and other drugs. For example, sodium nitrite can be used to produce nitrofuran drugs, which have an inhibitory effect on pathogens such as bacteria and fungi.
3. Food additive
Sodium nitrite can be used as a food additive for color protection and anti-corrosion of meat products. In the process of meat processing, sodium nitrite can react with myoglobin in meat to generate stable nitrosomyoglobin, which makes meat products show bright pink. At the same time, sodium nitrite also has the effect of inhibiting the growth of Clostridium botulinum, which helps to extend the shelf life of meat products.

need to pay attention to is that sodium nitrite has a certain toxicity, excessive intake may cause harm to human health. Therefore, when using sodium nitrite as a food additive, it is necessary to strictly control its dosage to ensure food safety.

In short, sodium nitrite has a wide range of application value in the field of chemical production raw materials, can be used as an oxidant, reducing agent, catalyst, etc. for chemical production, pharmaceutical manufacturing and food additives and other fields. In the process of use, attention should be paid to controlling its dosage to ensure safety and effectiveness.

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