Sodium chloride is an ionic compound with the chemical formula NaCl. It is a colorless cubic crystal or a fine crystalline powder with a salty taste. The appearance is white crystal, and its source is mainly seawater, which is the main component of table salt. Soluble in water, glycerin, slightly soluble in ethanol (alcohol), liquid ammonia; insoluble in concentrated hydrochloric acid. Impure sodium chloride is deliquescent in air.  The stability is relatively good, and its aqueous solution is neutral. Industrially, the method of electrolytically saturated sodium chloride solution is generally used to produce hydrogen, chlorine and caustic soda (sodium hydroxide) and other chemical products (commonly called chlor-alkali industry). It can be used in ore smelting (electrolytic melting of sodium chloride crystals to produce active metal sodium), medically used to configure physiological saline, and daily life can be used for condiments.