Lead(II) bromide

Lead(II) bromide

Lead(II) bromide
Names
IUPAC name Lead(II) bromide
Other names Lead dibromide
Identifiers
CAS Number	10031-22-8 Y
PubChem	24831
Properties
Chemical formula	PbBr2
Molar mass	367.01 g/mol
Appearance	white powder
Density	6.66 g/cm3
Melting point	370.6 °C (699.1 °F; 643.8 K)
Boiling point	916 °C (1,681 °F; 1,189 K) (vaporizes)
Solubility in water	0.455 g/100 mL (0 °C) 0.973 g/100 mL (20 °C) 4.41 g/100 mL (100 °C)
Solubility product (Ksp)	1.86 x 10−5 (20 °C)
Solubility	insoluble in alcohol; soluble in ammonia, alkali, KBr, NaBr
Vapor pressure	{{{value}}}
Related compounds
Other anions	Lead(II) fluoride, Lead(II) chloride, Lead(II) iodide
Other cations	Thallium(I) bromide, Tin(II) bromide Bismuth bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Lead(II) bromide is the inorganic compound with the formula PbBr₂. It is a white powder. It is produced in the burning of typical leaded gasolines.

Preparation and properties

It is typically prepared from treating solutions of lead salts (e.g., (lead(II) nitrate) with bromide salts. This process exploits its low solubility in water - only 0.455 g dissolves in 100 g of water at 0 °C. It is about ten times more soluble in boiling water.

Lead bromide was prevalent in the environment as the result of the use of leaded gasoline. Tetraethyl lead was once widely used to improve the combustion properties of gasoline. To prevent the resulting lead oxides from fouling the engine, gasoline was treated with an organobromine compound that converted lead oxides into the more volatile lead bromide, which was then exhausted from the engine into the environment.

Safety

Like other compounds containing lead, lead dibromide is categorized as probably carcinogenic to humans (Category 2A), by the International Agency for Research on Cancer (IARC). Its release into the environment as a product of leaded gasoline was highly controversial.