What is the chemical formula for calcium carbonate?

The chemical formula for calcium carbonate is represented as CaCO3. This compound consists of one calcium (Ca) atom, one carbon (C) atom, and three oxygen (O) atoms. It is a significant compound found in various natural substances, including limestone, marble, and chalk, and is widely used in construction, as a calcium supplement, and in various chemical processes.

Calcium carbonate is known for its application in water treatment, where it can be used to neutralize acidic waters or act as a buffering agent in different treatments. Understanding the composition of calcium carbonate is crucial for professionals in water treatment as it plays a significant role in maintaining water quality and managing pH levels.

The other options represent different compounds: CaO is calcium oxide, which is formed from calcium and oxygen, Ca(OH)2 is calcium hydroxide, commonly known as quicklime, and CO2 is carbon dioxide, a gas that plays various roles in environmental processes but is not related to calcium carbonate as a chemical formula.