In an ancient industrial process, lead was indeed heated at 600°C in air [lead melts at 327.5 °C] to produce a grey powder containing metallic lead.
PURE lead (II) oxide can be prepared in one of 2 ways:By heating lead(II) nitrate:
2Pb(NO3)2 → 2PbO + 4NO2 + O2
or
By heating lead (II) carbonate:
PbCO3 → PbO + CO2
The latter process is preferred since the production of toxic nitrogen dioxide (NO2) is avoided.
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