Sodium sulfide (technical sodium sulphide)is a compound that is widely used in industry. So, this substance is used in metallurgy, as well as chemical, light and other industries. Sodium sulfide, in particular, is used in the production of cellulose, dyes, in the processing of natural leather. The substance is also used in the melting of a number of non-ferrous metals. Sodium sulfide is indispensable in the field of analytical chemistry. It is used as a reagent in various processes.
Sodium sulfide. The formula (Na2S)
The normal aggregate state of matteris considered a homogeneous mass, characterized by high photosensitivity, or hygroscopic crystals. The substance is produced in the form of a monolith of 3 marks and in loose form (in the form of scales or granules). Apply a product with a light brown, pale yellow or grayish color. More intense or any other color indicates a significant oxidation of the substance. Such sodium sulphide loses useful characteristics and is not suitable for practical use. The technical product contains from sixty-three to sixty-seven percent of the basic substance, provided that the mass fraction of insoluble precipitate is not more than half of a percent.
In accordance with the classification by leveldanger for man sodium sulphurous is assigned a second class. The substance is flammable and explosive. In this regard, it is preferable to store the material in enclosed spaces, which are equipped with all the means necessary to ensure fire safety. It is not recommended to remove the packaging from the product before the immediate use of the substance. While maintaining the tightness of the container, sodium sulphide can be stored for up to two years. The period of effective use is only one year.
Transportation of the product should be carried out atassistance of any means of transport in closed wagons or containers. Much attention should be paid to loading and unloading of the substance, especially if direct contact with the product packed in soft containers is supposed. During transportation it is necessary to avoid temporary storage in open areas or warehouses that are insufficiently equipped for this.
Sodium chloride technical Chineseproduction is packed into special bags of twenty-five kilograms. The container provides protection against premature oxidation and exposure to light. In addition, steel drums used exclusively for chemical products, containers (SK-1-5 (7)) or soft containers for one-time use are used as packagings. The substance can be packaged in paper bags (four- or five-layered) with an inner liner - a polyethylene bag. Bags can have a net mass of not more than fifty kilograms.
Packaged in specialized containers, the substance is transported in a rolling stock of an open type.
The density of the product is 1.856 grams per cubic centimeter. The melting point reaches 1180 degrees. The product is highly hygroscopic. In water at twenty degrees 13.6% dissolve, at 97.5 degrees - 45% of the substance. The product is capable of forming crystalline hydrates. For aqueous solutions of sodium sulfurous technical characteristic of alkaline reaction.
Hydrolysis of sodium sulphide is carried out in the same way,as well as salts, which are formed by a weak acid and a strong base. Phenolphthalein in a test tube with a solution turns pink. This indicates that an alkaline medium formed in the test tube. Thus, sodium sulphide, like other salts that are formed by a weak acid and a strong base, hydrolyses, resulting in the formation of alkali.
