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[Chemical Knowledge]：Sodium diacetate-an important laboratory reagent and preservative

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1. chemical characteristics
of
sodium diacetate (NaOOCCH3 · CH3COONa) is a white crystal, soluble in water, ethanol, acetaldehyde, benzene and other organic solvents. Its molecular formula is (C2H3NaO2)2 and its molecular weight is 142.09g/mol. Hydrolysis of sodium diacetate produces a mixture of sodium acetate and sodium acetate, which has a certain acidity. In addition, sodium diacetate also has good corrosion resistance, can effectively extend the shelf life of food and drugs.

2. preparation method

sodium diacetate commonly used acetic acid and sodium carbonate as raw material preparation. The specific reaction equation is as follows:

2 CH3COOH Na2CO3 → 2 NaOOCCH3 · CH3COONa CO2 ↑ H2O

In the preparation process, acetic acid is mixed with sodium carbonate and heated to react to produce sodium diacetate. Then, a certain amount of water is added, and after crystallization, pure sodium diacetate is obtained.

3. Application field

Because sodium diacetate has good anti-corrosion properties, it is widely used in food, medicine, cosmetics and other fields. Sodium diacetate solution can kill bacteria, fungi and yeast and other microorganisms, prolong the service life of the product, improve the quality of the product. In addition, sodium diacetate can also be used as a metal corrosion protection agent, rubber desiccant and dye intermediates.

In the laboratory, sodium diacetate is also a common reagent. It can be used as complexing reagent, acetate reagent, phosphate reagent and standard material. Sodium diacetate has a wide range of applications and is of great significance.

4. precautions

During the use of sodium diacetate, special attention should be paid to safety issues. Because of its acidity, it can be irritating and corrosive when in contact with human organs such as skin and eyes. Therefore, when using sodium diacetate, it is necessary to take personal protective measures, such as wearing gloves, work clothes, wearing goggles, etc. At the same time, it is necessary to control the amount and concentration of sodium diacetate according to the specific use requirements to prevent the risk of injury to people and articles.

summary: Sodium diacetate is an important organic compound with a wide range of applications. In the preparation process, it is necessary to pay attention to operational safety and environmental protection; in the use process, it is necessary to master its chemical characteristics and use methods, and give full play to its excellent performance in experiments and production activities.