Lead(II) iodide

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Lead(II) iodide
Lead(II) iodide
Lead iodide.jpg
CAS number 10101-63-0 YesY
PubChem 167719
ChemSpider 23305 YesY
Jmol-3D images Image 1
Molecular formula 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)
Solubility in water 0.044 g/100 mL (0 °C)
0.0756 g/100 mL (20 °C)[1]
0.41 g/100 mL (100 °C)[2]
Solubility product, Ksp 4.41 x 10−9 (20 °C)
Solubility insoluble in ethanol, cold HCl
soluble in alkalis, KI solution
Crystal structure Rhombohedral, hP3, SpaceGroup = P-3m1, No. 164
EU Index 082-001-00-6
EU classification Repr. Cat. 1/3
Harmful (Xn)
Dangerous for the environment (N)
R-phrases R61, R20/22, R33, R62, R50/53
S-phrases S53, S45, S60, S61
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 4: Very short exposure could cause death or major residual injury. E.g., VX gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
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 noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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]


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)


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

See also[edit]


  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

External links[edit]