Copper(II) chloride facts for kids

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Copper(II) chloride
Anhydrous (without water molecules attached) copper(II) chloride
Copper(II) chloride dihydrate
Hydrated (with water molecules attached) copper(II) chloride

Copper(II) chloride, also known as cupric chloride, is a chemical compound. Its chemical formula is CuCl2. It contains copper in its +2 oxidation state. It also contains chloride ions.


Copper(II) chloride is light brown when anhydrous. It is green when hydrated. It is a weak oxidizing agent. It reacts with aluminium foil to make hydrogen, copper(I) oxide, and aluminium chloride. This is used in school demonstrations. It releases chlorine and turns into copper(I) chloride when heated very hot. It reacts with sodium hydroxide to make copper(II) hydroxide. Copper(II) chloride reacts with metals to make metal chlorides and copper. It puts out blue flames if it is heated in a flame. It reacts with sulfur dioxide to make copper(I) chloride. It dissolves in water to make a blue solution. When more chloride is added, it turns green, then yellow.


Copper chloride crystals
Crystals of copper(II) chloride in a container

It is made by reacting copper with chlorine. It can also be made by reacting copper(II) hydroxide, copper(II) oxide, or copper(II) carbonate with hydrochloric acid and from pure copper and from 1:1 solution of hydrogen peroxide and hydrochloric acid where copper first get oxidized to CuO from H2O2 and then reacts with HCl to form CuCl2, reaction goes like this:

Cu + H2O2 → CuO + H2O

CuO + 2HCl → CuCl2 + H2O


Copper(II) chloride is used to make fungicides. It is also used to make organic compounds. It is also used to make acetaldehyde from ethane.


It is toxic, with toxicity similar to copper sulfate It is therefore harmful.

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