Its antioxidant properties can be expressed quantitatively as a redox potential : A reducing agent is a chemical term for an antioxidant. Iodide salts are mild reducing agents and many react with oxygen to give iodine. This effect is due to the formation of the triiodide ion, which is brown:ģ Redox, including antioxidant properties Īqueous solutions of iodide salts dissolve iodine better than pure water. A test for the presence of iodide ions is the formation of yellow precipitates of these compounds upon treatment of a solution of silver nitrate or lead(II) nitrate. The low solubility of silver iodide and lead iodide reflects the covalent character of these metal iodides. One consequence of this is that sodium iodide is highly soluble in acetone, whereas sodium chloride is not. Iodide, being large, is less hydrophilic compared to the smaller anions. Most iodide salts are soluble in water, but often less so than the related chlorides and bromides. In part because of its size, iodide forms relatively weak bonds with most elements. For comparison, the lighter halides are considerably smaller: bromide (196 pm), chloride (181 pm), and fluoride (133 pm). It is assigned a radius of around 206 picometers. Iodide is one of the largest monatomic anions. Structure and characteristics of inorganic iodides 1.1 Redox, including antioxidant properties.1 Structure and characteristics of inorganic iodides.
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