What is Copper(I) iodide?
[[File:Copper(I) iodide.jpg|thumb|Copper(I) iodide]] '''Copper(I) iodide''', also known as '''cuprous iodide''', is a [[chemical compound]]. Its chemical formula is CuI. It has [[copper]] and [[iodide]] [[ion]]s in it. The copper is in its +1 [[oxidation state]]. ==Properties== Copper(I) iodide is a white solid. It does not dissolve in water. It easily turns tan or brown. It is a [[reducing agent]]. The iodide easily oxidizes to [[iodine]]. Copper does not form a stable copper(II) iodide; copper(II) iodide breaks down right away to make copper(I) iodide and iodine. It dissolves in concentrated iodides like [[potassium iodide]]. When it is diluted, it makes copper(I) iodide again. ==Preparation== It can be made by reacting iodine and copper in concentrated [[hydroiodic acid]]. Another way would be to react [[copper(II) sulfate]] and potassium iodide. This makes copper(II) iodide which as said before breaks down right away to make iodine and copper(I) iodide. ==Uses== It is used to make [[organic chemistry|organic]] compounds. It is also used to make [[cloud]]s [[rain]]. It is used to make [[nylon]] resistant to heat. It can be used to put iodine to foods. ==Related pages== *[[Copper(I) bromide]] *[[Copper(I) chloride]] [[Category:Copper compounds]] [[Category:Iodine compounds]]