| Formula / Notation | CaO |
|---|---|
| CAS Number | 1305-78-8 |
| Molecular Weight | 56.08 |
| Melting Point | 4662 °F (NIOSH, 2024) |
| Boiling Point | 5162 °F at 760 mmHg (NIOSH, 2024) |
| Density | 3.3 at 68 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | Reacts with water (NIOSH, 2024) |
| Appearance | Calcium oxide appears as an odorless, white or gray-white solid in the form of hard lumps. A strong irritant to skin, eyes and mucous membranes. Used in insecticides and fertilizers. |
| Also Known As | oxocalcium; Calcia; Calxyl; Gebrannter kalk; Unslaked lime; Calcium monoxide; Airlock; CALX; Calx usta; Chaux vive |
| Category | Inorganic Compounds |
What is Calcium oxide?
Calcium oxide is a member of the class of calcium oxides of calcium and oxygen in a 1:1 ratio. It has a role as a fertilizer.
Formula & Notation
IUPAC Name: oxocalcium
Other Names / Synonyms: oxocalcium; Calcia; Calxyl; Gebrannter kalk; Unslaked lime; Calcium monoxide; Airlock; CALX; Calx usta; Chaux vive
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 4662 °F (NIOSH, 2024) |
| Boiling Point | 5162 °F at 760 mmHg (NIOSH, 2024) |
| Density | 3.3 at 68 °F (USCG, 1999) - Denser than water; will sink |
| Molecular Weight | 56.08 |
| Solubility | Reacts with water (NIOSH, 2024) |
| Appearance | Calcium oxide appears as an odorless, white or gray-white solid in the form of hard lumps. A strong irritant to skin, eyes and mucous membranes. Used in insecticides and fertilizers. |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Calcium oxide is a member of the class of calcium oxides of calcium and oxygen in a 1:1 ratio. It has a role as a fertilizer.
Used in industrial processes, materials science, semiconductor manufacture, ceramics, or as a catalyst.
May be corrosive, toxic, or an oxidising agent. Handle in well-ventilated area. Consult SDS before use.
The formula or notation for Calcium oxide is: CaO