What is Copper(II) oxide?
[[File:CopperIIoxide.jpg|thumb|Copper(II) oxide]] '''Copper(II) oxide''', also known as '''cupric oxide''', is a [[chemical compound]]. Its chemical formula is CuO. It has [[copper]] in its +2 [[oxidation state]]. It also has [[oxide]] [[ion]]s. == Properties == Copper(II) oxide is a black solid. It dissolves in acids to make copper(II) [[salt]]s. It can react with [[carbon monoxide]] or [[hydrogen]] to make copper metal. It dissolves in very concentrated [[alkali]]s. It dissolves in ammonia to make a dark blue solution, similar to copper(II) hydroxide. == Preparation == It can be made by heating [[copper(II) hydroxide]]. It can also be made by heating copper in air. It can also be made by heating [[copper(II) carbonate]] or [[copper(II) nitrate]]. == Uses == Copper(II) oxide is used to color [[ceramic]]s. It is also used to make [[wikt:thermite|thermite]]. It can react with many toxic chemicals to [[oxidation|oxidize]] them, so they are not toxic any more. It can be added to vitamins to get copper into the body. It can also be added to clothing to kill germs. == Safety == Copper(II) oxide is toxic when eaten. It can be eaten in very small amounts, such as in vitamins. This adds copper to the body, which is needed. == Related pages == *[[Copper(I) chloride]] *[[Copper(I) oxide]] [[Category:Copper compounds]] [[Category:Oxides]]