Sodium hydroxide, chemical formula NaOH, commonly known as caustic soda, caustic soda, caustic soda, emits ammonia smell when dissolved, is a strong corrosive strong alkali, usually in the form of flakes or granules, easily soluble in water (exothermic when dissolved in water) and form an alkaline solution, and also deliquescent, easily absorb water vapour in the air (deliquescence) and carbon dio