Names | |
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IUPAC name
Silver(I) iodide
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Other names
Argentous iodide
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.029.125 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
AgI | |
Molar mass | 234.77 g/mol |
Appearance | yellow, crystalline solid |
Odor | odorless |
Density | 5.68 g/cm3, solid[1] |
Melting point | 558 °C (1,036 °F; 831 K)[1] |
Boiling point | 1,506 °C (2,743 °F; 1,779 K)[1] |
0.03 mg/L (20 °C)[1] | |
Solubility product (Ksp)
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8.52 × 10 −17[2] |
−80.0·10−6 cm3/mol[3] | |
Structure[5] | |
Hexagonal, hP4 | |
P63mc, No. 186 | |
a = 0.4591 nm, c = 0.7508 nm α = 90°, β = 90°, γ = 120°
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Formula units (Z)
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2 |
4.55 D[4] | |
Thermochemistry[6] | |
Heat capacity (C)
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56.8 J·mol−1·K−1 |
Std molar
entropy (S⦵298) |
115.5 J·mol−1·K−1 |
Std enthalpy of
formation (ΔfH⦵298) |
−61.8 kJ·mol−1 |
Gibbs free energy (ΔfG⦵)
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−66.2 kJ·mol−1 |
Hazards | |
GHS labelling:[7] | |
Warning | |
H410 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Safety data sheet (SDS) | Sigma-Aldrich |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Silver iodide is an inorganic compound with the formula AgI. The compound is a bright yellow solid, but samples almost always contain impurities of metallic silver that give a grey colouration. The silver contamination arises because some samples of AgI can be highly photosensitive. This property is exploited in silver-based photography. Silver iodide is also used as an antiseptic and in cloud seeding.