Overview of Lead Oxide

Lead(II) oxide is the chemical compound with the formula PbO. Lead(II) oxide occurs in two forms: red, having a tetragonal crystal structure and yellow, having an orthorhombic crystal structure. Both forms occur naturally as minerals: the red form is known as litharge and the yellow form is known as massicot.

Preparation and structure

PbO is prepared by heating lead metal in air at 600 C. Alternatively, it is obtained by the thermal decomposition of lead(II) nitrate or lead carbonate:

2Pb(NO3)2) → 2PbO + 4NO2 + O2
PbCO3 → PbO + CO2

The structure of the solid, determined by X-ray crystallography, reveals a pyramidal four-coordinate Pb center. The pyramidal nature indicates the presence of a stereochemically active lone pair of electrons.
Reactions

The red and yellow forms of this material are related by a small change in enthalpy: PbO(red) → PbO(yellow) ΔH = 1.6 kJ/mol

PbO is amphoteric, which means that it reacts with both acids and with bases. With acids, it forms salts of Pb2+ via the intermediacy of oxo clusters such as [Pb6O(OH)6]4+. With strong base, PbO dissolves to form plumbite(II) salts: PbO + H2O + OH- → [Pb(OH)3]-

Synthetic lead(II) oxide prepared by heating lead or certain lead compounds in air is called LITHARGE. It is a poisonous yellow or reddish-yellow solid, used in making lead glass, pottery glazes, and rubber

PbO is a component of paints and in glass, as well as in vulcanization of rubber. A mixture with glycerine sets to a hard, waterproof cement that has been used to join the flat glass sides and bottoms of aquaria. PbO is used in certain condensation reactions in organic synthesis.[3] PbO is the main ingredient of the paste used for filling the plates during manufacturing of lead-acid batteries.

PbO is used in cathode ray tube glass to block X-ray emission, but mainly in the neck and funnel because it can cause discoloration when used in the faceplate. Strontium oxide is preferred for the faceplate.

Glazing pottery, Glass flux for painting, Lead glass; Metal cement with Glycerol; Storage batteries; Ointments and Plasters; Preparing lead subacetate solutions. Pproducing iridescent colors on brass and bronze; Coloring sulfur-containing substances; Pigment for rubber; Oil refining; Varnishes, Paints, and Enamels; Aassays for precious metal ores

Reactions


The red and yellow forms of this material are related by a small change in enthalpy: PbO(red) → PbO(yellow) ΔH = 1.6 kJ/mol

PbO is amphoteric, which means that it reacts with both acids and with bases. With acids, it forms salts of Pb2+ via the intermediacy of oxo clusters such as [Pb6O(OH)6]4+. With strong base, PbO dissolves to form plumbite(II) salts: PbO + H2O + OH- → [Pb(OH)3]-

product identification
CAS NO. 1317-36-8
EINECS NO. 215-267-0
FORMULA PbO
MOL WT. 223.20
H.S. CODE 2824.10
SYNONYMS
Lead (II) oxide; Lead monoxide; Lead oxide yellow; C.I. 77577; Lead protoxide; Litharge yellow L-28; Massicot; Massicotite; Pigment yellow 46; Yellow lead ocher; plumbous oxide;
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE reddish yellow powder, odorless
MELTING POINT 888 C
BOILING POINT 1470 C
SPECIFIC GRAVITY 9.53
SOLUBILITY IN WATER Insoluble in water and alcohol
SOLubility soluble in acetic acid, nitric acid, alkalies
pH Strong base
NFPA RATINGS Health: 3 Flammability: 0 Reactivity: 0
STABILITY Stable under ordinary conditions

 

SALES SPECIFICATION
APPEARANCE Yellow powder
LEAD MONOXIDE 99.3% max
LEAD PEROXIDE 0.1% max
RESIDUE IN NITRIC ACID 0.1% max
MOISTURE 0.2% max
IRON OXIDE 0.005% max
COPPER OXIDE 0.002% max
PARTICLE SIZE +180 mesh : 0.5% max
TRANSPORTATION
PACKING 25kgs in bag
HAZARD CLASS 5.1
UN NO. 1479