Characteristic

Calcium peroxide or calcium dioxide is the inorganic compound with the formula CaO₂. It is the peroxide (O₂²−) salt of Ca2+. Commercial samples can be yellowish, but the pure compound is white. It is almost insoluble in water.

Chemical formula:CaO₂

Molar mass:72.0768 g/mol

Appearance:white or yellowish powder

Odor:odorless

Density:2.91 g/cm³

Melting point:~ 355 °C (671 °F; 628 K) (decomposes)

Solubility in water:decomposes

Acidity (pKa):12.5

Magnetic susceptibility (χ):-23.8·10⁻⁶ cm³/mol

Refractive index (nD):1.895

Crystal structure:Orthorhombic

Application

Calcium peroxide is used as a rubber stabilizer, used in different areas of industry and agriculture. In agriculture it is used as an oxygen fertilizer, and is also used in the presowing treatments of rice seed. It is used as flour bleaching agent and improving agent.