Kalkhydroxid

Kalkhydroxid, also known as slaked lime or hydrated lime, has the chemical formula Ca(OH)₂. It is a white, powdery substance that is produced by the reaction of calcium oxide (quicklime) with water. This process is called slaking. Kalkhydroxid is an alkaline compound with a pH typically around 12.4 in a saturated solution. It is sparingly soluble in water, forming a milky suspension known as limewater.

Historically, kalkhydroxid has been used for a variety of purposes, including in construction as a mortar and plaster component, and in agriculture to neutralize acidic soils. Its alkaline nature makes it effective in treating wastewater and in the purification of drinking water. In industrial processes, it is utilized in the production of paper, steel, and in the refining of sugar.

Kalkhydroxid can be irritating to skin, eyes, and the respiratory system due to its caustic nature. Proper handling precautions, such as wearing gloves and eye protection, are recommended when working with it. Despite its irritant properties, it is a widely available and relatively inexpensive chemical with numerous practical applications. Its production from limestone, a readily available natural resource, contributes to its widespread use across various industries.