Sodium chloride, chemical formula NaCl, colorless cubic crystal or fine crystalline powder, salty. The appearance is white crystal, the source of which is mainly seawater. Soluble in water, glycerin, slightly soluble (alcohol), liquid ammonia; insoluble in concentrated hydrochloric acid. Impure sodium chloride is deliquescent in the air. The stability is better, the aqueous solution is neutral, and the industry generally uses electrolytic saturated sodium chloride solution to produce hydrogen, chlorine and caustic soda (sodium hydroxide) and other chemical products (generally called chlor-alkali industry) can also be used for ore. Smelting (electrolytic melting of sodium chloride crystals to produce active sodium metal). 
Sodium chloride is a white odorless crystalline powder with a melting point of 801 ° C and a boiling point of 1465 ° C. It is slightly soluble in ethanol, propanol and butane. It becomes a plasma after being miscible with propane. It is easily soluble in water. The solubility in water is 35.9g. (room temperature). NaCI is dispersed in alcohol to form a colloid, and its solubility in water is reduced by the presence of hydrogen chloride, and it is hardly soluble in concentrated hydrochloric acid. 
Classification is divided into raw salt and refined salt from the process.