When sodium carbonate is exposed to air for a long time, it can absorb moisture and carbon dioxide in the air and generate sodium bicarbonate.
Sodium carbonate (na? CO？ ), molecular weight 105.99. The purity of chemicals is more than 99.5% (mass fraction), which is also called soda ash, but it belongs to salt, not alkali.
It is an important organic chemical raw material, which is mainly used to produce flat glass, glass products and ceramic glaze. It is also widely used in household washing, acid neutralization and food processing.
Extended data:
Take hydrochloric acid as an example. When hydrochloric acid is sufficient, sodium chloride and carbonic acid are generated, and unstable carbonic acid is immediately decomposed into carbon dioxide and water. This reaction can be used to prepare carbon dioxide:
The general chemical equation is:
When the amount of hydrochloric acid is small, the following reactions will occur:
Similar reactions will occur between sodium carbonate and other kinds of acids.
Sodium carbonate can react with calcium salt and barium salt to form precipitation and new sodium salt;
Because sodium carbonate hydrolyzes in water to generate sodium hydroxide and carbonic acid, its reaction with some salts will push the chemical balance to move in the positive direction, generating corresponding alkali and carbon dioxide:
Sodium sulfide may explode when it is hit or heated violently, and its chemical properties are unstable. Toxic hydrogen sulfide gas will be released in case of acid;
Sodium sulfide can be used to produce sulfide dyes in dye industry, and it is the raw material of sulfide blue and sulfide blue. Printing and dyeing industry is used as dyeing auxiliary for dissolving sulfur dyes.
In leather industry, it is used to hydrolyze leather to remove hair, and in paper industry, it is used as cooking agent for paper. It can also be used as mordant for cotton fabric dyeing in textile industry and used to produce antipyretics in pharmaceutical industry. Sodium sulfide can also be used to treat conductive layers in direct electroplating. Sodium sulfide reacts with palladium to form colloidal palladium sulfide, which forms a good conductive layer on the nonmetal surface.
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