Limestone is a form of sedimentary rock, that is mainly composed of calcium carbonate (CaCO3).

Limestone cycle[edit | edit source]

  • 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.
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