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Solid caustic soda, also known as sodium hydroxide (NaOH), commonly known as caustic soda, is a white crystal with strong corrosivity at room temperature. Easy to dissolve in water, its aqueous solution is strongly alkaline and can turn phenolphthalein red. Sodium hydroxide is a very common alkali, which is one of the necessary drugs for chemical laboratories. Its solution can be used as a washing solution.