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Sodium hydroxide, with the chemical formula of NaOH, commonly known as caustic soda, is a strong alkali, generally in the form of flakes or blocks, which is easily soluble in water (heat release when dissolved in water) and forms an alkaline solution. In addition, it is of deliquescence, which is easy to absorb water vapor (deliquescence) and carbon dioxide (deterioration) in the air. Hydrochloric acid can be added to check whether it deteriorates.