Calcium Carbonate (CaCO3)-Powder

Characteristic




Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks.




Chemical formula：CaCO3

Molar mass：100.0869 g/mol

Appearance：Fine white powder; chalky taste

Odor：odorless

Density：2.711 g/cm3 (calcite)    2.83 g/cm3 (aragonite)

Melting point：1,339 °C (2,442 °F; 1,612 K) (calcite)   825 °C (1,517 °F; 1,098 K) (aragonite)

Boiling point：decomposes

Solubility in water：0.013 g/L (25 °C)

Solubility product (Ksp)：3.3×10−9

Solubility in dilute acids：soluble

Acidity (pKa)：9.0

Magnetic susceptibility (χ)：−3.82×10−5 cm3/mol

Refractive index (nD)：1.59

Crystal structure：Trigonal




Application




Calcium carbonate is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale. It is medicinally used as a calcium supplement or as an antacid, but excessive consumption can be hazardous and cause poor digestion.