Sunrise Chemicals

Calcium oxide, also known as quicklime, is a chemical compound of calcium and oxygen12. It is a white, caustic, alkaline, crystalline solid2. When dissolved in water, it releases heat and changes into calcium hydroxide13. It is manufactured by heating coal, limestone, seashells, or chalk4

Calcium oxide (CaO), commonly known as quicklime, is a white, alkaline, and crystalline solid at room temperature. It is a highly reactive compound, primarily produced by heating limestone (calcium carbonate, CaCO₃) in a process called calcination, which drives off carbon dioxide (CO₂) and leaves behind calcium oxide.

Key properties of calcium oxide include:

1. Appearance: White, solid powder or lumps.
2. Chemical Reactivity: It reacts vigorously with water to form calcium hydroxide (Ca(OH)₂), a process that is exothermic (releases heat).
3. Solubility: Calcium oxide is not very soluble in water, but it dissolves in water to form an alkaline solution known as limewater.
4. Basicity: It is a strong base and is often used to neutralize acids.
5. High melting point: It has a very high melting point of about 2,572°C (4,662°F).

Uses:

• Industrial: Calcium oxide is widely used in the production of cement and lime, as well as in the manufacture of steel and glass.
• Environmental: It is used to treat acidic soils and water, neutralizing excess acidity.
• Chemical production: It plays a role in various chemical processes, including the production of calcium carbide (CaC₂) for acetylene gas.

When calcium oxide reacts with water, it forms calcium hydroxide, which is also known as slaked lime. This reaction is highly exothermic and is a crucial step in several industrial and environmental processes.