LEAD SESQUIOXIDE Chemical Properties

Melting point:

decomposes at 370℃ [KIR78]

Density 

10.050

solubility 

insoluble in H2O; soluble in alkaline solutions; reacconc HCl

form 

red amorphous powder

color 

black monoclinic crystals, crystalline or red amorphous powder

Water Solubility 

insoluble H2O; decomposed by conc HCl, H2SO4, evolving Cl2 or O2 [MER06]; soluble alkalies [HAW93]

crystal system

Monoclinic

Space group

P21/a

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.7814	0.5625	0.8465	90	124.8	90	0.3055

EPA Substance Registry System

Lead trioxide (1314-27-8)

LEAD SESQUIOXIDE Usage And Synthesis

Chemical Properties

reddish yellow amorphous powder(s); obtained from PbO2 by hydrothermal reaction; used in ceramics, ceramic cements, metallurgy, and in varnishes [HAW93] [MER06] [KIR78]

Physical properties

Orange-yellow amorphous powder; decomposes at 370°C; insoluble in cold water; decomposes in hot water and acids.

Uses

Lead trioxide is a catalyst for oxidation of carbon monoxide in exhaust gases. Other uses are vulcanizing neoprene rubber; fireproofing plastics; detecting radiation; and manufacturing high-purity diamonds.

Preparation

Lead trioxide is prepared by adding sodium hypochlorite or bromine to an aqueous solution of sodium plumbite.

Hazard

Tetraethyl lead is a highly toxic compound manifesting both acute and chronic effects. These effects are insomnia, hypotension, hypothermia, tremor,.

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