Everything about Lead Ii Oxide totally explained
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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's obtained by the thermal decomposition of lead(II) nitrate or lead carbonate:
» 2Pb(NO
3)
2 → 2PbO + 4NO
2 + O
2
PbCO
3 → PbO + CO
2
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 Pb
2+ via the intermediacy of oxo
clusters such as [Pb
6O(OH)
6]
4+. With strong base, PbO dissolves to form
plumbite(II) salts:
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.
Further Information
Get more info on 'Lead Ii Oxide'.
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