Lead(II) oxide
- Litharge
- Lead monoxide
- Litharge
- Massicotit
Orthorhombic or tetragonal yellow -red crystals
Fixed
9.53 g · cm -3
888 ° C
1470 ° C
Insoluble in water (17 mg · l -1)
Risk
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Lead (II ) oxide is a compound of the chemical elements with the oxygen lead and ratio formula PbO. More lead oxides in addition to lead (II ) oxide, lead (II, IV) oxide and lead ( IV) oxide.
Production and representation
Lead (II ) oxide is prepared by simple combustion in air:
Properties
Lead (II ) oxide is known to a red solid in a tetragonal crystal structure, and as a mineral under the name of litharge. At 488 ° C, in this modification converts a yellow rhombic modification, which is known as under the name Mineral Massicotit. Because of the low rate of conversion at low temperatures the yellow modification occurs as a metastable compound.
Use
( Chromate ) or with nitric acid and dichromate to the pigment chrome yellow implemented - Among the names Massicotit, litharge, lead yellow, royal yellow, or silver Neugelb smoothness lead (II ) oxide was also used as a pigment. Massicotit but has a good hiding power, is not very stable. When it is exposed to light and air, it turns blackish - brown, which is attributed to the formation of lead (IV ) oxide. Moreover, it is sensitive to acids and bases. Massicotit has been used very early, especially because of its siccative effect on linseed oil and other oily binder (oil painting). End of the Middle Ages, it was replaced by the more stable lead-tin yellow ( stannate ).
Litharge was formerly used for medicated patch (lead plaster ).
Safety
Repeated exposure are effects on the blood, kidneys and central nervous system possible (lead poisoning). Formation of anemia, functional disorders. A strong impairment of fertility is also possible.