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Reference.org
Triiodide
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<p>In chemistry, triiodide usually refers to the triiodide ion, I−3. This anion, one of the <a href="/facts/Polyhalogen_ions/9ax8aEnV">polyhalogen ions</a>, is composed of three <a href="/facts/Iodine/JlfMecMf">iodine</a> atoms. It is formed by combining <a href="/facts/Aqueous_solution/eRNr3MH2">aqueous solutions</a> of <a href="/facts/Iodide/JyVRGWMX">iodide</a> salts and <a href="/facts/Iodine/JlfMecMf">iodine</a>. Some salts of the anion have been isolated, including <a href="/facts/Thallium_triiodide/RFb4Dtuk">thallium(I) triiodide</a> (Tl+[I3]−) and <a href="/facts/Ammonium_triiodide/rLP2qLTz">ammonium triiodide</a> ([NH4]+[I3]−). Triiodide is observed to be a red colour in solution. </p>