Lead Dioxide
Title: Lead Dioxide
CAS Registry Number: 1309-60-0
CAS Name: Lead oxide (PbO2)
Additional Names: lead (IV) oxide; lead oxide brown; lead peroxide; lead superoxide
Molecular Formula: O2Pb
Molecular Weight: 239.20
Percent Composition: O 13.38%, Pb 86.62%
Literature References: Occurs in nature as the mineral plattnerite. Lab prepn from lead acetate and calcium hypochlorite: Newell, Maxson, Inorg. Synth. 1, 45 (1939); by hydrolysis of lead acetate: Kuhn, Hammer, Ber. 83, 413 (1950). Review of toxicology: B. Venugopal, T. D. Luckey, Environ. Qual. Safety Suppl. 1, 4-73 (1975).
Properties: Dark-brown powder; evolves oxygen when heated, first forming Pb3O4, at high temp PbO. d 9.38. Insol in water. Sol in HCl with evolution of Cl; in dil HNO3 in presence of H2O2, oxalic acid, or other reducers; sol in alkali iodide solns with liberation of iodine; soluble in hot caustic alkali solns. LD50 i.p. in guinea pigs: 220 mg/kg (Venugopal, Luckey).
Density: d 9.38
Toxicity data: LD50 i.p. in guinea pigs: 220 mg/kg (Venugopal, Luckey)
Use: Electrodes in batteries; oxidizing agent in manuf dyes; as discharge in dyeing with indigo; manuf rubber substitutes; with amorphous phosphorus as ignition surface for matches; pyrotechny; manuf pigments; in anal. chemistry.

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