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Lead(II) iodide

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Title: Lead(II) iodide  
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Lead(II) iodide

Lead(II) iodide
Lead(II) iodide
Names
Other names
Plumbous iodide
Identifiers
 Y
ChemSpider  Y
Jmol-3D images Image
PubChem
UNII  Y
Properties
PbI2
Molar mass 461.01 g/mol
Appearance bright yellow powder
Odor odorless
Density 6.16 g/cm3
Melting point 402 °C (756 °F; 675 K)
Boiling point 872 °C (1,602 °F; 1,145 K)
0.044 g/100 mL (0 °C)
0.0756 g/100 mL (20 °C)[1]
0.41 g/100 mL (100 °C)[2]
4.41 x 10−9 (20 °C)
Solubility insoluble in ethanol, cold HCl
soluble in alkalis, KI solution
Structure
Rhombohedral, hP3
P-3m1, No. 164
octahedral
Hazards
Repr. Cat. 1/3
Harmful (Xn)
Dangerous for the environment (N)
R-phrases R50/53
S-phrases S53, S45, S60, S61
NFPA 704
0
3
0
Flash point Non-flammable
Related compounds
Other anions
Lead(II) fluoride
Lead(II) chloride
Lead(II) bromide
Other cations
Tin(II) iodide
Related compounds
Thallium(I) iodide
Bismuth(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Lead(II) iodide (PbI2) or plumbous iodide is a bright yellow solid at room temperature, that reversibly becomes brick red by heating. In its crystalline form it is used as a detector material for high energy photons including x-rays and gamma rays.

Lead iodide is toxic due to its lead content. In the nineteenth century it was used as an artists' pigment under the name Iodine Yellow, but it was too unstable to be useful.[3]

Contents

  • Preparation 1
  • Properties 2
  • See also 3
  • References 4
  • External links 5

Preparation

Lead iodide can be obtained as a yellow precipitate by reacting solutions of lead(II) nitrate and potassium iodide:

Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

The yellow precipitate dissolves in an excess of KI solution, forming a colourless solution of the tetraiodoplumbate:[4]

Pb(I2)(s) + 2KI(aq) ⇄ K2PbI4(aq)

Properties

It is sparingly soluble in cold water but quite soluble in hot water, yielding a colorless solution; on cooling it crystallizes as yellow hexagonal platelets.

Lead(II) iodide precipitates when solutions of potassium iodide and lead(II) nitrate are combined
Experiment "golden rain" where iodide of lead (II) was recrystallized from hot solution by cooling, forming crystals of golden-yellow.

See also

References

  1. ^ NIST-data review 1980
  2. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  3. ^ Salter, Thomas W., Field’s Chromatography: or Treatise on Colours and Pigments as Used by Artists By George Field. An entirely new and practical edition revised, rewritten and brought down to the present time, 1869
  4. ^ Satya Prakash, Advanced Inorganic Chemistry Volume 1, 2006, ISBN 81-219-0263-0

External links

  • Toxic Substances Portal - Lead


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