The purification of sodium chloride is 80% to 90%.

When the yield is 100%, there are no impurities in the crude salt and there is no loss during the purification process, but this is impossible in reality. There must be impurities in sodium chloride, and there must be losses during the purification process. The product quality must be less than the original quality, so the yield is less than 100%.

Related as follows

Sodium chloride is an inorganic ionic compound with the chemical formula NaCl. It is colorless cubic crystals or fine crystalline powder and tastes salty. It looks like white crystals, and its source is mainly sea water, which is the main component of table salt. Easily soluble in water and glycerol, slightly soluble in ethanol (alcohol) and liquid ammonia; insoluble in concentrated hydrochloric acid.

Impure sodium chloride is deliquescent in the air. The stability is relatively good, and its aqueous solution is neutral. In industry, the electrolysis of saturated sodium chloride solution is generally used to produce hydrogen, chlorine, caustic soda (sodium hydroxide) and other chemical products (generally known as the chlor-alkali industry). It can also be used in ores. Smelting (electrolysis of molten sodium chloride crystals to produce active sodium metal).