Lead Monoxide
Title: Lead Monoxide
CAS Registry Number: 1317-36-8
CAS Name: Lead oxide (PbO)
Additional Names: lead (II) oxide; lead oxide yellow; plumbous oxide; litharge; massicot; lead protoxide
Molecular Formula: OPb
Molecular Weight: 223.20
Percent Composition: O 7.17%, Pb 92.83%
Line Formula: PbO
Literature References: Prepn of high purity PbO: Kwestroo, Huizing, J. Inorg. Nucl. Chem. 27, 1591 (1965); Kwestroo et al., ibid. 29, 39 (1967). Mfg processes: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 509-513. Toxicity study: W. R. Bradley, W. G. Fredrick, Ind. Med. 10, Ind. Hyg. Sect. 2, 15 (1941). Review of toxicology and human exposure: Toxicological Profile for Lead (PB99-166704, 1999) 640 pp.
Properties: Exists in two forms: red to reddish-yellow, tetragonal crystals, stable at ordinary temp; yellow, orthorhombic crystals, stable above 489°: Petersen, J. Am. Chem. Soc. 63, 2617 (1941). Poisonous! At 300-450° in the air, it converts slowly into Pb3O4, but at higher temp reverts to PbO. d 9.53. mp 888°. Insol in water, alcohol. Sol in acetic acid, dil HNO3, in warm solns of fixed alkali hydroxides. LD50 i.p. in rats: 40 mg Pb/100g (Bradley, Fredrick).
Melting point: mp 888°
Density: d 9.53
Toxicity data: LD50 i.p. in rats: 40 mg Pb/100g (Bradley, Fredrick)
Use: In ointments, plasters; preparing soln of lead subacetate. Glazing pottery; glass flux for painting on porcelain and glass; lead glass; varnishes; with glycerol as metal cement; producing iridescent colors on brass and bronze; coloring sulfur-containing substances, e.g., hair, nails, wool, horn; manuf artificial tortoise shell and horn; pigment for rubber; manuf boiled linseed oil; in assay of gold and silver ores.

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