kalciumhidrogénkarbonátot

Kalciumhidrogénkarbonát, also known as calcium bicarbonate, is a chemical compound with the formula Ca(HCO₃)₂. It is a salt formed from the cation calcium (Ca²⁺) and the anion bicarbonate (HCO₃⁻). This compound is not typically isolated in a pure solid form due to its instability and tendency to decompose readily upon heating or concentration.

In nature, kalciumhidrogénkarbonát is primarily found dissolved in water. It is the main component responsible for temporary hardness in water. When water containing dissolved carbon dioxide comes into contact with calcium carbonate (limestone or chalk), the calcium carbonate reacts to form calcium bicarbonate. This process is reversible; if the water is heated or the carbon dioxide escapes, the calcium bicarbonate decomposes back into calcium carbonate, water, and carbon dioxide, leading to the formation of scale.

The presence of kalciumhidrogénkarbonát in water is significant in geological processes, particularly in the formation of caves and stalactites/stalagmites. The dissolution and precipitation of calcium carbonate due to the presence of dissolved carbon dioxide and bicarbonate ions are key mechanisms in these formations. Industrially, it is encountered in water treatment processes aimed at softening hard water. It can also be found in mineral springs.