Calcium peroxide

Calcium peroxide
Names
	Other names Calcium dioxide;
Identifiers
CAS Number	1305-79-9 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:48233 ;
ChemSpider	14096 ;
ECHA InfoCard	100.013.764
EC Number	215-139-4;
E number	E930 (glazing agents, ...)
Gmelin Reference	674257
KEGG	C18566;
PubChem CID	14779;
RTECS number	EW3865000;
UNII	7FRO2ENO91 ;
UN number	1457
CompTox Dashboard (EPA)	DTXSID4050489 ;
	InChI InChI=1S/Ca.O2/c;1-2/q+2;-2 Key: LHJQIRIGXXHNLA-UHFFFAOYSA-N ; InChI=1/Ca.O2/c;1-2/q+2;-2 Key: LHJQIRIGXXHNLA-UHFFFAOYAW;
	SMILES [Ca+2].[O-][O-];
Properties
Chemical formula	CaO2
Molar mass	72.076 g·mol−1
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
Structure
Crystal structure	Orthorhombic
Space group	Pna21
Coordination geometry	8
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H315, H319, H335
Precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, P405, P501
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	>5000 mg/kg (oral, rat) ; >10000 mg/kg (dermal, rat)
Related compounds
Other anions	Calcium oxide
Other cations	Strontium peroxide; Barium peroxide; Sodium peroxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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.

Names

Other names Calcium dioxide
Identifiers
CAS Number	1305-79-9^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:48233^Y
ChemSpider	14096^Y
ECHA InfoCard	100.013.764
EC Number	215-139-4
E number	E930 (glazing agents, ...)
Gmelin Reference	674257
KEGG	C18566
PubChem CID	14779
RTECS number	EW3865000
UNII	7FRO2ENO91^Y
UN number	1457
CompTox Dashboard (EPA)	DTXSID4050489
InChI InChI=1S/Ca.O2/c;1-2/q+2;-2^Y Key: LHJQIRIGXXHNLA-UHFFFAOYSA-N^Y InChI=1/Ca.O2/c;1-2/q+2;-2 Key: LHJQIRIGXXHNLA-UHFFFAOYAW
SMILES [Ca+2].[O-][O-]
Properties
Chemical formula	CaO₂
Molar mass	72.076 g·mol⁻¹
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 (pK_a)	12.5
Magnetic susceptibility (χ)	−23.8·10⁻⁶ cm³/mol
Refractive index (n_D)	1.895
Structure
Crystal structure	Orthorhombic
Space group	Pna2₁
Coordination geometry	8
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H315, H319, H335
Precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, P405, P501
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	>5000 mg/kg (oral, rat) >10000 mg/kg (dermal, rat)
Related compounds
Other anions	Calcium oxide
Other cations	Strontium peroxide Barium peroxide Sodium peroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is ^YN ?) Infobox references