Lead(II) bromide

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.[3]

Lead(II) bromide
Names
IUPAC name
Lead(II) bromide
Other names
Lead dibromide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.065
UNII
Properties
PbBr2
Molar mass 367.01 g/mol
Appearance white powder
Density 6.66 g/cm3 [1]
Melting point 370.6 °C (699.1 °F; 643.8 K)
Boiling point 916 °C (1,681 °F; 1,189 K) (vaporizes)
0.455 g/100 mL (0 °C)
0.973 g/100 mL (20 °C)[2]
4.41 g/100 mL (100 °C)
1.86 x 10−5 (20 °C)
Solubility insoluble in alcohol;
soluble in ammonia, alkali, KBr, NaBr
−90.6·10−6 cm3/mol
Hazards
Repr. Cat. 1/3
Harmful (Xn)
Dangerous for the environment (N)
R-phrases (outdated) R61, R20/22, R33, R62, R50/53
S-phrases (outdated) S53, S45, S60, S61
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
3
0
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).
N verify (what is YN ?)
Infobox references

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.[4]

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.[3]

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.

References
  1. Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
  2. NIST-data review 1980
  3. Michael J. Dagani, Henry J. Barda, Theodore J. Benya, David C. Sanders "Bromine Compounds" in Ullmann's Encyclopedia of Industrial Chemistry" Wiley-VCH, Weinheim, 2000.doi:10.1002/14356007.a04_405
  4. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
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