| Revision as of 13:07, 15 February 2012 editBeetstra (talk | contribs)Edit filter managers, Administrators172,031 edits Saving copy of the {{chembox}} taken from revid 475984417 of page Calcium_peroxide for the Chem/Drugbox validation project (updated: ''). |
Latest revision as of 16:18, 26 April 2024 edit Moriwen (talk | contribs)Extended confirmed users, New page reviewers26,879 editsm Spelling/grammar/punctuation/typographical correction |
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{{Short description|Chemical compound}} |
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}} |
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{{Redirect|CaO2|"CaO2" as a symbol for arterial oxygen content|Hypoxia (medical)#arterial oxygen content}} |
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{{Chembox |
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{{Chembox |
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| Watchedfields = changed |
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| Watchedfields = changed |
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| verifiedrevid = 443496220 |
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| verifiedrevid = 476998612 |
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| Name = Calcium peroxide |
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| Name = Calcium peroxide |
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| ImageFile =BaO2structure.jpg |
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| ImageFile = Crystal structure of CaO2.jpg |
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| ImageName = Calcium peroxide |
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| ImageName = Calcium peroxide |
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| OtherNames = E930 |
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| OtherNames = {{Unbulleted list |
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| Calcium dioxide<ref>{{cite web | url=https://sor.epa.gov/sor_internet/registry/substreg/searchandretrieve/advancedsearch/externalSearch.do?p_type=SRSITN&p_value=82271 | title=Substance Registry Services | US EPA }}</ref> |
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| Section1 = {{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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|Section1={{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 14096 |
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| ChemSpiderID = 14096 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| ChEBI_Ref = {{ebicite|correct|EBI}} |
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| ChEBI_Ref = {{ebicite|correct|EBI}} |
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| ChEBI = 48233 |
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| ChEBI = 48233 |
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| EC_number = 215-139-4 |
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| Gmelin = 674257 |
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| KEGG = C18566 |
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| UNNumber = 1457 |
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| SMILES = . |
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| SMILES = . |
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| InChIKey = LHJQIRIGXXHNLA-UHFFFAOYAW |
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| InChIKey = LHJQIRIGXXHNLA-UHFFFAOYAW |
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| StdInChIKey = LHJQIRIGXXHNLA-UHFFFAOYSA-N |
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| StdInChIKey = LHJQIRIGXXHNLA-UHFFFAOYSA-N |
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| CASNo = 1305-79-9 |
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| CASNo = 1305-79-9 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| PubChem = 14779 |
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| PubChem = 14779 |
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| RTECS = EW3865000 |
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| RTECS = EW3865000 |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Ca=1 | O=2 |
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| Formula = CaO<sub>2</sub> |
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| MolarMass = 72.0768 g/mol |
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| Density = 2.91 g/cm<sup>3</sup> |
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| Appearance = white or yellowish powder |
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| ExactMass = 71.95242 |
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| Odor = odorless |
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| Density = 2.91 g/cm<sup>3</sup> |
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| Solubility = decomposes |
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| Appearance = white or yellowish powder |
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| MeltingPt= ~ |
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| Odor = odorless |
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| MeltingPtC = 355 |
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| Solubility = decomposes |
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| MeltingPt_notes = (decomposes) |
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| MeltingPt = ~200 °C (decomp.) |
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| BoilingPt = |
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| BoilingPt = |
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| pKa = 12.5 |
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| Appearance = white to yellow powder |
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| pKa = 12.5 |
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| RefractIndex = 1.895 |
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| MagSus = -23.8·10<sup>−6</sup> cm<sup>3</sup>/mol |
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| RefractIndex = 1.895 |
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| Section3 = {{Chembox Structure |
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|Section3={{Chembox Structure |
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| CrystalStruct = Orthorhombic<ref name=a1>{{cite journal |journal=RSC Advances |year=2013 |title=Structures and stabilities of alkaline earth metal peroxides XO2 (X = Ca, Be, Mg) studied by a genetic algorithm |first1=X. |last1=Zhao |doi=10.1039/C3RA43617A |last2=Nguyen |first2=M.C. |last3=Wang |first3=C.Z. |last4=Ho |first4=K.M. |volume=3 |issue=44 |page=22135 |bibcode=2013RSCAd...322135Z |url=https://zenodo.org/record/1230026 }}</ref> |
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| CrystalStruct = Tetragonal |
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| SpaceGroup = D<sup>17</sup><sub>4h</sub>, I4/mmm, ] |
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| SpaceGroup = Pna2<sub>1</sub> |
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| Coordination = 6 |
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| Coordination = 8<ref name=a1/> |
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| Section7 = {{Chembox Hazards |
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|Section7={{Chembox Hazards |
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| ExternalMSDS = |
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| ExternalSDS = |
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| GHSPictograms = {{GHS03}}{{GHS07}} |
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| EUClass = |
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| GHSSignalWord = Warning |
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| EUIndex = Not listed |
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| HPhrases = {{H-phrases|272|315|319|335}} |
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| RPhrases = |
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| PPhrases = {{P-phrases|210|220|221|261|264|271|280|302+352|304+340|305+351+338|312|321|332+313|337+313|362|370+378|403+233|405|501}} |
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| SPhrases = |
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| LD50 = <br> >5000 mg/kg (oral, rat) <br> >10000 mg/kg (dermal, rat) |
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| LD50 = >5000 mg/kg (oral, rat) <br> >10000 mg/kg (dermal, rat) |
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| Section8 = {{Chembox Related |
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|Section8={{Chembox Related |
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| OtherAnions = ] |
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| OtherAnions = ] |
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| OtherCations = ]<br/>]<br/>] |
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| OtherCations = ]<br/>]<br/>] |
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'''Calcium peroxide''' or '''calcium dioxide''' is the ] with the formula CaO<sub>2</sub>. It is the ] (O<sub>2</sub><sup>2−</sup>) salt of Ca<sup>2+</sup>. Commercial samples can be yellowish, but the pure compound is white. It is almost insoluble in ].<ref name = Ullmann>{{Ullmann | title = Peroxo Compounds, Inorganic | vauthors = Jakob H, Leininger S, Lehmann T, Jacobi S, Gutewort S |display-authors=3| doi = 10.1002/14356007.a19_177.pub2}}</ref> |
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==Structure and stability== |
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As a solid, it is relatively stable against decomposition. In contact with water however it hydrolyzes with release of oxygen. Upon treatment with an ], it forms ]. |
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==Preparation== |
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Calcium peroxide is produced by combining ] salts and ]: |
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:Ca(OH)<sub>2</sub> + H<sub>2</sub>O<sub>2</sub> → CaO<sub>2</sub> + 2 H<sub>2</sub>O |
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The octahydrate precipitates upon the reaction of ] with dilute ]. Upon heating it dehydrates. |
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==Applications== |
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It is mainly used as an oxidant to enhance the extraction of precious metals from their ores. In its second main application, it is used as a ] under the ] E930 it is used as ] and ].<ref name = Ullmann/> |
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In agriculture it is used in the presowing treatments of ] seed. Also, calcium peroxide has found use in ] to oxygenate and disinfect water. In the ecological restoration industry it is used in the treatment of soils. Calcium peroxide is used in a similar manner to ] for environmental restoration programs. It is used to restore soil and groundwater contaminated with petroleum by the process of enhanced in-situ ]. It is a minor component of some dentifrices. |
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It is also used for curing {{chem name|polythioether}} polymers by oxidising terminal thiol groups to disulphide bridges.{{cn|date=July 2022}} |
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==References== |
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{{reflist}} |
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{{E number infobox 920-929}} |
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{{Calcium compounds}} |
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{{oxygen compounds}} |
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{{DEFAULTSORT:Calcium Peroxide}} |
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] |
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] |