At room temperature is a white crystals, widely used

Sodium hydroxide (NaOH), commonly known as caustic soda, Huo Jian, caustic soda, caustic soda by another name is called Ge Shi in Hong Kong, the room temperature is a white crystal, with a strong corrosive. Soluble in water, its aqueous solution was strongly alkaline, can phenolphthalein red. Sodium hydroxide is an extremely popular base, is one of the chemical laboratory of the essential drugs. Its solution can be used as washing liquid.