Inorganic compound, chemical formula NaOH, also known as caustic soda, caustic soda, solid alkali, caustic soda, caustic soda. Sodium hydroxide is strongly alkaline and corrosive, and can be used as acid neutralizer, complexing masking agent, precipitant, precipitation masking agent, color developing agent, saponifying agent, stripping agent, detergent, etc. , and is widely used.