Limestone is a form of sedimentary rock, that is mainly composed of calcium carbonate (CaCO3).
- When limestone is heated, it decomposes to form quicklime (CaO) and carbon dioxide (CO2).
- When a small amount of water is added to the quicklime, slaked lime is produced.
- When a lot of water is added, the slaked lime turns into limewater (Ca(OH)2).
- When carbon dioxide is bubbled through the limewater, limestone and water is produced again.