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| Names | |
|---|---|
Other names
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| Identifiers | |
3D model (JSmol)
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| ChEBI | |
| ChemSpider | |
| 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)
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>5000 mg/kg (oral, rat) >10000 mg/kg (dermal, rat) |
| Related compounds | |
Other anions
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Calcium oxide |
Other cations
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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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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]
- ^ "Substance Registry Services | US EPA".
- ^ a b Zhao, X.; Nguyen, M.C.; Wang, C.Z.; Ho, K.M. (2013). "Structures and stabilities of alkaline earth metal peroxides XO2 (X = Ca, Be, Mg) studied by a genetic algorithm". RSC Advances. 3 (44): 22135. Bibcode:2013RSCAd...322135Z. doi:10.1039/C3RA43617A.
- ^ Jakob H, Leininger S, Lehmann T, et al. "Peroxo Compounds, Inorganic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_177.pub2. ISBN 978-3527306732.