Sodium chloride (Sodium chloride) is an inorganic ionic compound, the chemical formula NaCl, colorless cubic crystal or fine crystalline powder, salty. The appearance is white crystalline, and its source is mainly seawater, which is the main component of salt. Soluble in water, glycerin, slightly soluble in ethanol (alcohol), liquid ammonia; Insoluble in concentrated hydrochloric acid. Impure sodium chloride is deliquescent in air. Its stability is relatively good, and its aqueous solution is neutral. Industry generally uses the method of electrolytic saturated sodium chloride solution to produce hydrogen, chlorine and caustic soda (sodium hydroxide) and other chemical products (generally known as chlor-alkali industry), can also be used for ore smelting (electrolytic molten sodium chloride crystals to produce active sodium metal), medical use to prepare normal saline, life can be used for condiments