Lead(II) iodide

Lead(II) iodide
Names
	Other names Plumbous iodide
Identifiers
CAS Number	10101-63-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	23305 ;
ECHA InfoCard	100.030.220
EC Number	233-256-9;
PubChem CID	24931;
UNII	OTL90F2GLT ;
UN number	2291 3077
CompTox Dashboard (EPA)	DTXSID101014310 ;
	InChI InChI=1S/2HI.Pb/h21H;/q;;+2/p-2 Key: RQQRAHKHDFPBMC-UHFFFAOYSA-L ; InChI=1/2HI.Pb/h21H;/q;;+2/p-2 Key: RQQRAHKHDFPBMC-NUQVWONBAP;
	SMILES I[Pb]I;
Properties
Chemical formula	PbI; 2
Molar mass	461.01 g/mol
Appearance	bright yellow powder
Odor	odorless
Density	6.16 g/cm3
Melting point	410 °C (770 °F; 683 K)
Boiling point	872 °C (1,602 °F; 1,145 K) decomp.
Solubility in water	0.44 g/L (0 °C); 0.76 g/L (20 °C); 4.1 g/L (100 °C);
Solubility product (Ksp)	4.41×10−9 (20 °C)
Solubility	insoluble in ethanol, cold HCl; soluble in alkalis, KI solution, methyl isopropyl ketone;
Band gap	2.34 eV (direct)
Magnetic susceptibility (χ)	−126.5·10−6 cm3/mol
Structure
Crystal structure	Hexagonal hP6
Space group	P63mc, No. 186
Lattice constant	a = 0.4556 nm, b = 0.4556 nm, c = 1.3973 nm α = 90°, β = 90°, γ = 120°°
Formula units (Z)	2
Coordination geometry	octahedral
Thermochemistry
Heat capacity (C)	77.4 J/(mol·K)
Std molar; entropy (S⦵298)	174.9 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−175.5 kJ/mol
Gibbs free energy (ΔfG⦵)	−173.6 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H332, H360, H373, H410
Precautionary statements	P201, P202, P260, P264, P270, P271, P273, P281, P301+P312, P304+P312, P304+P340, P308+P313, P312, P314, P330, P391, P405, P501 Preview warning: Omit Rules: keep P260, omit P261
NFPA 704 (fire diamond)	3 0 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). verify (what is ?) Infobox references

Lead(II) iodide (or lead iodide) is a chemical compound with the formula PbI
₂. At room temperature, it is a bright yellow odorless crystalline solid, that becomes orange and red when heated. It was formerly called plumbous iodide.

The compound currently has a few specialized applications, such as the manufacture of solar cells, X-rays and gamma-ray detectors. Its preparation is used in chemistry education to teach topics such as precipitation reactions and stoichiometry. It is decomposed by light at temperatures above 125 °C (257 °F), and this effect has been used in a patented photographic process.

Lead iodide was formerly employed as a yellow pigment in some paints, with the name iodide yellow. However, that use has been largely discontinued due to its toxicity and poor stability.