The chemical formula of quicklime is CaO , which is calcium oxide.

Quick Scoop: What Is Quicklime?

Quicklime is the common name for calcium oxide, an ionic compound made of calcium and oxygen atoms in a 1:1 ratio, hence the formula CaO.

It is also called burnt lime or unslaked lime and is distinct from slaked lime, which is calcium hydroxide, Ca(OH)₂.

Key Facts at a Glance

  • Chemical name: Calcium oxide.
  • Common name: Quicklime (also burnt lime, unslaked lime).
  • Chemical formula of quicklime: CaO.
  • Related compound: Slaked lime (calcium hydroxide), formula Ca(OH)₂.

Tiny Forum-Style Note

“People often mix up quicklime and slaked lime. A good memory trick: quicklime is ‘O-only’ (CaO), while slaked lime has ‘O plus H’ (Ca(OH)₂).”

SEO Extras

  • Focus keyword: chemical formula of quicklime = CaO.
  • Meta description: Quicklime, also known as calcium oxide, has the chemical formula CaO and is different from slaked lime, which is calcium hydroxide, Ca(OH)₂.

TL;DR: The chemical formula of quicklime is CaO (calcium oxide).

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