Potassium hydroxide is commonly known as caustic potash, potassium ash, etc. There are two main forms of industrial products, which are solid and liquid. The solid is in the shape of white or light gray flakes or blocks, and the liquid potassium hydroxide is in the form of light yellow liquid. The chemical properties are similar to sodium hydroxide, it is highly alkaline and corrosive, it is easily soluble in water and will release a lot of heat, and it is also deliquescent, it is easy to absorb moisture in the air and deliquescence, and it is formed by absorbing carbon dioxide potassium carbonate. Generates a lot of heat when dissolved in water, alcohol or treated with acid. The pH of 0.1mol/L solution is 13.5. (without water). Moderate toxicity, median lethal dose (rat, oral) 1230mg/kg. At present, potassium hydroxide is mainly used to synthesize potassium carbonate, potassium permanganate, etc., and is mainly used in many fields such as chemical industry, food, medicine, and agriculture.