Calcium hydroxide is an inorganic compound with the chemical formula Ca (OH) 2, commonly known as hydrated lime. It is a white powdery solid with alkalinity and bitterness. It can absorb carbon dioxide from the air and convert it into calcium carbonate. After adding water, it is divided into upper and lower layers. The upper aqueous solution is called clear lime water, and the lower suspension is called lime milk or lime slurry. The upper clear lime water can detect carbon dioxide, while the lower turbid liquid lime milk is a building material. It is almost insoluble in water and soluble in saturated solutions of glycerol and sucrose. Strong alkalinity, pH value 12.4CAS number: 1305-62-0 MF: Ca (OH) MW: 74.096 PH=12.4 Appearance: white powdery solid with alkaline and slightly bitter taste Usage: 1. Commonly used as acidity regulator (pH regulator), regulator, neutralizer, and hardener 2. Can be used as a coagulant for making konjac food, beer, and cocoa products 3. In the sugar industry, calcium hydroxide is first used to neutralize syrup, and then carbon dioxide is introduced to react with the remaining calcium hydroxide to form a precipitate, which is filtered out to reduce the acidity of sugar 4. Calcium hydroxide is alkaline, so it can be used to reduce the acidity of pastries and improve the taste of baked goods.