silver iodide
n.
A pale yellow, odorless powder, AgI, that darkens on exposure to light and is used in photographic emulsions, rainmaking, and medicine, especially as an antiseptic.
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A pale yellow, odorless powder, AgI, that darkens on exposure to light and is used in photographic emulsions, rainmaking, and medicine, especially as an antiseptic.
A pale yellow, odorless, tasteless powder that darkens when exposed to light and that is used as an antiseptic.
The noun has one meaning:
Meaning #1:
an iodide that is used in photography, in seeding clouds to make rain, and in medicine
| Silver iodide | |
|---|---|
| General | |
| Other names | Silver(I) iodide |
| Molecular formula | AgI |
| Molar mass | 234.773 g/mol |
| Appearance | yellow, crystalline solid |
| CAS number | [7783-96-2] |
| Properties | |
| Density and phase | 5.675 g/cm3, solid |
| Solubility in water | 3x10-7g/100mL (20 °C) it is not soluble in water |
| Melting point | 552°C |
| Boiling point | 1506°C |
| Thermochemistry | |
| ΔfH0solid | -62.4 kJ/mol at 1 atm |
| Hazards | |
| EU classification | not listed |
| NFPA 704 | ![]() ![]() ![]() |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Silver iodide (AgI) is a chemical compound used in photography and as an antiseptic in medicine. Silver iodide is highly insoluble in water and has a crystalline structure similar to that of ice, allowing it to induce freezing (heterogeneous nucleation) in cloud seeding for the purpose of rainmaking.
The crystalline structure adopted by silver iodide changes with temperature. The following phases are known:[1]
The transition between the β and α forms represents the melting of the silver (cation) sublattice. The entropy of fusion (melting) for α-AgI is approximately half that for sodium chloride (a typical ionic solid). This can be rationalised by noting that the AgI crystalline lattice has essentially already partly melted in the transition between α and β forms. Adding the entropy of transition from α-AgI to β-AgI to the entropy of fusion gives a value that is much closer to the entropy of fusion for sodium chloride.
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