What are the properties of sodium sulfide?
Created date: 2020/04/16

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Perhaps you often hear about anhydrous sodium sulfide or crystal sodium sulfide, but you may not know the nature of sodium sulfide. I will give you a comprehensive introduction to sodium sulfide.

Main:

What is sodium sulfide?

Physical properties

Chemical properties

Application field


What is sodium sulfide?


Inorganic compounds, also known as stinky base, odor soda, xanthine, and sodium sulfide. Pure sodium sulfide is a colorless crystalline powder. Strong moisture absorption, soluble in water. The aqueous solution is strongly alkaline. It can cause burns when it comes into contact with skin and hair. Therefore, sodium sulfide is commonly known as sodium sulfide. The aqueous sodium sulfide solution is slowly oxidized in the air to sodium thiosulfate, sodium sulfite, sodium sulfate, and sodium polysulfide. Since the formation of sodium thiosulfate is faster, the main product of oxidation is sodium thiosulfate. Sodium sulfide deliquesces in the air, carbonizes and deteriorates, and continuously releases hydrogen sulfide gas. Industrial sodium sulfide has a color of pink, brownish red, and khaki because it contains impurities. Specific gravity, melting point, and boiling point also vary depending on the influence of impurities.


A colorless, transparent crystal with an odor. Dissolved in cold water, very soluble in hot water, slightly soluble in alcohol. Industrial products are generally mixed with different crystal waters, and contain different degrees of impurities. In addition to different appearance colors, density, melting point, boiling point, etc. are also affected by impurities.


Physical properties


At normal temperature, the pure product is a colorless or slightly purple prismatic crystal, and the industrial product is often pink, brownish red, and khaki block due to impurities.

Has a bad smell. Dissolved in cold water, very soluble in hot water, slightly soluble in alcohol. Industrial products are generally mixed with different crystal waters, and contain different degrees of impurities. In addition to different appearance colors, density, melting point, boiling point, etc. are also affected by impurities.


Chemical properties


Hydrogen sulfide is generated by decomposition in an acid. Deliquescent in the air, while gradually oxidizing, generating hydrogen sulfide in the presence of acid. Shocked, high heat can be explosive. In case of acid, toxic hydrogen sulfide gas, anhydrous sodium sulfide is flammable, and emits toxic sulfur oxide fumes.


Health hazard: This product can decompose hydrogen sulfide in the gastrointestinal tract, which can cause hydrogen sulfide poisoning after oral administration. Corrosive to skin and eyes. Hazardous characteristics: Explosion may occur by impact or rapid heating. In case of acid decomposition, it releases a highly toxic flammable gas. Combustion (decomposition) products: hydrogen sulfide, sulfur oxides. Acute toxicity: LD50820mg/kg (mouse oral); 950mg/kg (mouse infusion). Correlation chemical reaction equation: 2Na+S=Na2S


Application field


1. Used in the dye industry to produce sulphur dyes, which are raw materials for sulphur blue and sulfur blue. The printing and dyeing industry is used as a dyeing aid for dissolving sulphur dyes. In the tanning industry, it is used for hydrolysis to remove the hide skin, and it is also used to prepare sodium polysulfide to accelerate the drying of the skin by the dry skin. The paper industry is used as a cooking agent for paper. The textile industry is used for the denitrification of man-made fibers and the reduction of nitrates, as well as mordants for the dyeing of cotton fabrics. The pharmaceutical industry is used to produce antipyretics such as phenacetin. In addition, it is also used to prepare sodium thiosulfate, sodium hydrosulfide, sodium polysulfide and the like.

2. Adding an appropriate amount of sodium sulfide in the aluminum and alloy alkaline etching solution can significantly improve the surface quality of the etching, and can also be used for the removal of alkali-soluble heavy metal impurities such as zinc in the alkaline etching solution.

3. Sodium sulfide can also be used for the treatment of the conductive layer in direct electroplating, and the colloidal palladium sulfide is formed by reacting sodium sulfide with palladium to achieve the purpose of forming a good conductive layer on the non-metal surface.

4. Used as a corrosion inhibitor. It is also a raw material of sodium thiosulfate, sodium polysulfide, sulphur dye, and the like.

5. Used in the manufacture of sulphur dyes, leather depilatory agents, metal smelting, photography, rayon denitration, etc.


The above content hopes to have some help for you!


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