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Information @ a Glance

  • 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 gray coloration.
  • Silver iodide exists in four different crystalline modifications a low-temperature cubic form with the sphalerite structure, a hexagonal form with the wurtzite structure, a high - temperature form with a disorder body centered cubic structure, and a high - pressure sodium chloride type cubic structure.
  • The silver contamination arises because AgI is highly photosensitive. This property is exploited in silver-based photography. Silver iodide is also used as an antiseptic and in cloud seeding.
  • Silver iodide is so commonly used for cloud seeding is that it is practically insoluble in water. That is, it stays in the solid form rather than dissolving in water. This
    characteristic is essential to the success of cloud seeding.
  • The crystalline structure of silver iodide closely resembles that of  ice, and as such it makes a very effective surrogate for  ice as nucleating agents in the cloud.
  • Initially was prepared by precipitation from solutions of varying concentration of silver nitrate and sodium iodide.
  • Silver iodide is prepared by reaction of an iodide solution (e.g., potassium iodide) with a solution of silver ions (e.g., silver nitrate).
  • Niepce, a scientist discovered that the vapour from iodine reacted with the silver coating to produce silver iodide, a light sensitive compound.

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