Nomenclature
CAS number: 1309-60-0
Lead oxide (PbO
2); lead (IV) oxide; lead oxide brown; lead peroxide; lead superoxide; plumbic oxide.
O
2Pb; mol wt 239.20.
O 13.38%, Pb 86.62%.
Description and 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. Oxidizer. 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).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 analytical chemistry.