Bleidioxid
PbO2 · LEAD PEROXIDE · Plattnerite · Lepro · LP-100 · ci77580 · c.i.77580 · leadbrown

Identifikatoren & physikalische Daten
| CAS No. | 1309-60-0 |
|---|---|
| Summenformel | O2Pb |
| Durchschnittliche Molmasse | 239 g/mol |
| Monoisotopische Masse | 239,96648134 g/mol |
| SMILES | [O]=[Pb]=[O] |
| InChIKey | YADSGOSSYOOKMP-UHFFFAOYSA-N |
| PubChem CID | 14793 |
| EC No. | 215-174-5 |
| DTXSID | DTXSID5025497 |
| Lokaler Name | Bleidioxid |
Chemische & physikalische Eigenschaften
| Polarare Oberfläche (TPSA) | 34,1 |
|---|---|
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 2 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 3 |
| Formalladung | 0 |
| Komplexität | 18,3 |
| Stoffklassen | Metals -> Lead Compounds, InorganicCarcinogens |
| SpringerMaterials Properties | electron density of states |
| Dichte | 9.375 at 66 °F (NTP, 1992) - Denser than waterwill sink9.375 g/cu cm9.38 g/cm³9.64 @25 °C9,38 g/cm3 |
| Color/Form | Brown, hexagonal crystalsDark-brown powderBrownish black crystalline powder consisting of fine crystalline flakes in either alpha- or beta-form. |
| Löslichkeit | Insoluble (NTP, 1992)In water, <11.3 ug/L at 25 °C, pH 6-7Insoluble in waterSoluble in hydrochloric acid with evolution of chlorinein dilute nitric acid in presence of hydrogen peroxide, oxalic acid, or other reducerssoluble in alkali iodide solutions with liberation of iodinesoluble in hot caustic alkali solutionsSoluble in glacial acetic acidinsoluble in alcoholPresumably soluble in acidic gastric juice |
| Decomposition | When heated to decomposition it emits toxic fumes of /lead/.Lead dioxide decomposes at 290 °C. /From table/290 °C. This produces oxygen and toxic fumes. Reacts violently with combustible substances, organic compounds, sulfur, hydrogen peroxide and phosphorus. This generates fire hazard. |
| Schmelzpunkt | 554 °F (decomposes) (NTP, 1992)290 °C, decomposition |
| Brechungsindex | Index of refraction: omega 2.3 (Li /lamp/) |
| Physical Description | Lead dioxide appears as brown, hexagonal crystals. Insoluble in water. Used in matches, explosives, electrodes.Other SolidWet SolidDry PowderBrown crystals that are insoluble in water[CAMEO]BROWN CRYSTALS OR POWDER. |
| Stability/Shelf Life | Stable under recommended storage conditions. |
| Other Experimental Properties | An oxidizing agentEvolves oxygen when heated, first forming Pb3O4, at high temperature, PbO.Decomposes rather easily to the lower oxide, releasing oxygen when heated to 290 °C and aboveHeat capacity: 61.5 J/mol-K at 27 °C |
| Aggregatzustand | Powder |
| Wichte | 9.38 |
| Farbe | Brown to black |
| Spezifische Wärmekapazität | Cp(crystal): 0.27 J/(g·K), at 25℃ |
| Merck | 14,5407 |
| InChI | InChI=1S/2O.Pb |
| InChIKey | YADSGOSSYOOKMP-UHFFFAOYSA-N |
| SMILES | [Pb](=O)=O |
| CAS Datenbank | 1309-60-0(CAS DataBase Reference) |
| NIST chemische Informationen | Lead dioxide(1309-60-0) |
| EPA chemische Informationen | Lead dioxide (1309-60-0) |
Sicherheit & Vorschriften
| GHS-Einstufung | DangerH272 (91.3%): May intensify fireoxidizer [Danger Oxidizing liquidsOxidizing solids]P203, P210, P220, P260, P261, P264, P270, P271, P273, P280, P301+P317, P304+P340, P317, P318, P319, P330, P370+P378, P391, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 242 reports by companies from 27 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.H272: May intensify fire |
|---|---|
| Regulatorische Informationen | Chemical: Lead oxide (PbO2)Lead oxide (PbO2) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Lead oxide (PbO2) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)Status: Active Update: 04-09-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/7459Restricted substance: Lead dioxideLead oxide: HSNO Approval: HSR001285 Approved with controlsThe New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.) |
| Weitere Sicherheitsinformationen | IMAP assessments - Lead oxides: Human health tier II assessment |
| DOT-Kennzeichnung | Oxidizer |
| Brandgefahren | Excerpt from ERG Guide 140 [Oxidizers]:CAUTION: Ammonium nitrate products may explode if involved in fire or contaminated with hydrocarbons (fuels), organic matter, other contaminants or when hot molten and contained. Treat as an explosive (GUIDE 112).Not combustible but enhances combustion of other substances. Gives off irritating or toxic fumes (or gases) in a fire. Risk of fire and explosion on contact with combustible substances or reducing agents. |
| Brandpotenzial | Lead dioxide does not burn but it will increase the intensity of a fire.Dangerous fire risk in contact with organic materials. |
| Gesundheitsgefahren |
Anwendungen & Verwendung
Beschreibung
Lead dioxide, PbO2, also plumbic oxide, is an odorless dark-brown crystalline powder which is nearly insoluble in water. It exists in two crystalline forms. The a phase has orthorhombic symmetry, lattice constants a=0.497 nm, b=0.596 nm, c= 0.544 nm, Z=4 (four formula units per unit cell).
Occurrence
Lead dioxide occurs in nature as the mineral plattnerite. It is used as an oxidizing agent in manufacturing dyes and intermediates. It also is used as a source of oxygen in matches, pyrotechnics, and explosives. In matches, the oxide is combined with amorphous phosphorus as an ignition surface. It also is used in making lead pigments, liquid polysulfide polymers and rubber substitutes. Lead dioxide electrodes are used in lead storage batteries in which lead dioxide accumulates on positive plates.
Verwenden
Lead dioxide occurs in nature as the mineral plattnerite. It is used as an oxidizing agent in manufacturing dyes and intermediates. It also is used as a source of oxygen in matches, pyrotechnics, and explosives. In matches, the oxide is combined with amorphous phosphorus as an ignition surface. It also is used in making lead pigments, liquid polysulfide polymers and rubber substitutes. Lead dioxide electrodes are used in lead storage batteries in which lead dioxide accumulates on positive plates.
Herstellung & Synthese
synthetische
Lead dioxide is produced by oxidizing an alkaline slurry of lead monoxide with chlorine, sodium hypochlorite, or bleaching powder. Alternatively, it is obtained by passing chlorine into a hot aqueous suspension of lead sulfate and magnesium hydroxide. The ionic reaction is: Pb(OH)3ˉ +ClOˉ → PbO2 + Clˉ+ OHˉ + H2O It also is produced by electrolysis of acidic solutions of lead salts using a lead or platinum electrode. In such electrolytic process, lead dioxide is deposited on the anode of the cell. Insoluble powdered lead dioxide also may be obtained when lead tetroxide is heated with nitric acid: Pb3 O4 + 4HNO3 → 2Pb(N)3)2 + PbO2 + 2H2O Lead dioxide also can be prepared by fusing lead monoxide with a mixture of sodium nitrate and sodium chlorate.