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| | Silver iodide Chemical Properties |
| Melting point | 557°C | | Boiling point | 1506°C | | density | 5.68 g/mL at 25 °C (lit.) | | RTECS | VW4450000 | | form | Solid | | Specific Gravity | 6.01 | | color | Yellow | | Odor | odorless | | Water Solubility | 0.03 mg/L | | Sensitive | Light Sensitive | | Crystal Structure | Cubic, Sphalerite Structure - Space Group F(-4)3m | | Merck | 14,8516 | | Solubility Product Constant (Ksp) | pKsp: 16.07 | | Exposure limits | ACGIH: TWA 0.01 ppm | | Stability: | Stability Light-sensitive. Incompatible with strong oxidizing agents. | | CAS DataBase Reference | 7783-96-2(CAS DataBase Reference) | | NIST Chemistry Reference | Silver iodide(7783-96-2) | | EPA Substance Registry System | Silver iodide (AgI) (7783-96-2) |
| | Silver iodide Usage And Synthesis |
| Description | Silver iodide (AgI) precipitates as a yellow, odor- and tasteless solid. Silver iodide acts as a very effective nucleus for the formation of ice crystals. Silver iodide has an important advantage over mercury as a subject for study of electrochemical properties of interfaces. It is also used as a solid lubricant for power contacts. It is also used as a local antiseptic.
| | References | [1] B. Vonnegut, The Nucleation of Ice Formation by Silver Iodide, Journal of Applied Physics, 1947, vol. 18, 593
[2] J. Lyklema and J. Th. G. Overbeek, Electrochemistry of silver iodide the capacity of the double layer at the silver iodide-water interface, Journal of Colloid Science, 1961, col. 16, 595-608
[3] Sylva Arnell and Gunnar Andersson, Silver Iodide as a Solid Lubricant for Power Contacts, Proceedings of the Forty-Seventh IEEE Holm Conference on Electrical Contacts, 2001
| | Chemical Properties | Yellow Crystalline Powder | | Physical properties | Light yellow hexagonal crystals or powder; darkens on exposure to light; density 5.68 g/cm3 ; melts at 558°C; vaporizes at 1,506°C; insoluble in water, most acids and ammonium carbonate solution; moderately soluble in concentrated solutions of alkali chloride, bromide, and thiosulfate; readily soluble in solutions of alkali cyanides, iodides and in hot concentrated hydriodic acid. | | Uses | In cloud precipitation (rain-making). | | Uses | Silver iodide is a yellow powder formed by the combination
of a soluble iodide combined with silver nitrate. Silver
iodide could also be formed by exposing metallic silver to the
fumes of bromine as in the daguerreotype process. This was
the primary halide used for all of the 19th century camera
processes until the introduction of the silver bromide gelatin
plate. With the exception of the daguerreotype, all silver iodide
processes relied on physical development using a reducing
agent such as gallic acid, pyrogallic acid, or ferrous sulfate, an
acid restrainer, and excess silver. | | Uses | Used in medicine for its caustic, astringent and antiseptic effects. Used in photography, and in the estimation of silver. Through heterogeneous nucleation, it is used in cloud seeding, relying on its beta-AgI crystal structure being similar to that of Ice. | | Preparation | Silver iodide is prepared by adding a solution of sodium or potassium iodide to a hot solution of silver nitrate: Ag+ (aq) + Iˉ (aq) → Ag I (s) The precipitate is washed with boiling water. The preparation is done in the dark under ruby red light. | | Flammability and Explosibility | Nonflammable |
| | Silver iodide Preparation Products And Raw materials |
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