Lead dioxide
Lead(IV) oxide, commonly known as lead dioxide, is an inorganic compound with the chemical formula PbO2. It is an oxide where lead is in an oxidation state of +4. It is a dark-brown solid which is insoluble in water. It exists in two crystalline forms. It has several important applications in electrochemistry, in particular as the positive plate of lead acid batteries.
| Names | |
|---|---|
| IUPAC name
Lead(IV) oxide | |
| Other names
Plumbic oxide Plattnerite | |
| Identifiers | |
| ChemSpider | |
| ECHA InfoCard | 100.013.795 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 1872 |
CompTox Dashboard (EPA) |
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| Properties | |
| PbO2 | |
| Molar mass | 239.1988 g/mol |
| Appearance | dark-brown, black powder |
| Density | 9.38 g/cm3 |
| Melting point | 290 °C (554 °F; 563 K) decomposes |
| insoluble | |
| Solubility | soluble in acetic acid insoluble in alcohol |
Refractive index (nD) |
2.3 |
| Structure | |
| hexagonal | |
| Hazards | |
| GHS labelling: | |
| Danger | |
| H272, H302, H332, H360, H372, H373, H410 | |
| P201, P202, P210, P220, P221, P260, P261, P264, P270, P271, P273, P280, P281, P301+P312, P304+P312, P304+P340, P308+P313, P312, P314, P330, P370+P378, P391, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other cations |
Carbon dioxide Silicon dioxide Germanium dioxide Tin dioxide |
| Lead(II) oxide Lead(II,IV) oxide | |
Related compounds |
Thallium(III) oxide Bismuth(III) oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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