Calcium peroxide
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"CaO2" redirects here. For "CaO2" as a symbol for arterial oxygen content, see Hypoxia (medical) § arterial oxygen content.
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.[3]
Quick Facts Names, Identifiers ...
Names | |
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Other names
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Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.013.764 |
EC Number |
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E number | E930 (glazing agents, ...) |
674257 | |
KEGG | |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 1457 |
CompTox Dashboard (EPA) |
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Properties | |
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) |
decomposes | |
Acidity (pKa) | 12.5 |
-23.8·10−6 cm3/mol | |
Refractive index (nD) |
1.895 |
Structure | |
Orthorhombic[2] | |
Pna21 | |
8[2] | |
Hazards | |
GHS labelling: | |
Warning | |
H272, H315, H319, H335 | |
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).
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