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Silver iodide

Basic information Description References Safety Related Supplier
Silver iodide Basic information
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 Gravity6.01
  • color Yellow
  • Water Solubility 0.03 mg/L
  • Sensitive Light Sensitive
  • Crystal StructureCubic, Sphalerite Structure - Space Group F(-4)3m
  • Merck 14,8516
  • Solubility Product Constant (Ksp)pKsp: 16.07
  • Stability:Stability Light-sensitive. Incompatible with strong oxidizing agents.
  • CAS DataBase Reference7783-96-2(CAS DataBase Reference)
  • NIST Chemistry ReferenceSilver iodide(7783-96-2)
  • EPA Substance Registry SystemSilver iodide (AgI) (7783-96-2)
Safety Information
MSDS
Silver iodide Usage And Synthesis
  • DescriptionSilver 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 PropertiesYellow Crystalline Powder
  • Physical propertiesLight 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.
  • UsesIn cloud precipitation (rain-making).
  • UsesSilver 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.
  • PreparationSilver 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.
Silver iodide Preparation Products And Raw materials
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