Lead(II) iodide

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Lead(II) iodide
Lead(II) iodide
Other names Lead diiodide, lead iodide
Identifiers
CAS number [10101-63-0]
Properties
Molecular formula PbI2
Molar mass 461.05 g/mol
Density 6.16 g/cm³
Melting point

403 °C
Boiling point

872 °C
Solubility in other solvents 1 g in 1350 mL cold water
1 g in 230 mL hot water
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Lead (II) iodide (PbI2) is a toxic, yellowish solid. It displays a range of colors with varying temperature from bright yellow at room temperature to brick red. On cooling, its color returns to yellow. In its crystalline form it is used as a detector material for high energy photons including x-rays and gamma rays. It is also known as plumbous iodide, derived from the latin name for lead plumbum.

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.[1]

Lead iodide is formed via precipitation by mixing lead(II) nitrate and potassium iodide:

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

The resultant bright yellow solids are easily recrystallized in hot water to yield brilliant yellow crystals.

[edit] References

  1. ^ 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

[edit] External links

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