Copper(II) chloride

Copper(II) chloride is an inorganic compound with formula CuCl₂, found as anhydrous and hydrated forms. Its copper is in the +2 oxidation state.

Copper: Copper is a chemical element with symbol Cu and atomic number 29. Copper supplies the +2 metal ion in the compound.
Copper(II) ion: The copper(II) ion is a copper atom that has lost two electrons, giving it a 2+ charge. It is the metal cation whose coordination environment changes when CuCl₂ dissolves.
Wacker process: The Wacker process oxidizes alkenes, especially ethylene, to carbonyl compounds using palladium and copper catalysts. Copper(II) chloride participates in regenerating the palladium catalyst in the process.
Copper(I) chloride: Copper(I) chloride is an inorganic copper compound with formula CuCl and copper in the +1 oxidation state. Its +1 copper and different stoichiometry distinguish it from copper(II) chloride.
Copper(II) chloride solution: Copper(II) chloride solution contains dissolved copper and chloride species in a solvent, usually water. Its color and speciation vary as water and chloride coordinate the copper ions.
Chlorine: Chlorine is a reactive halogen element with symbol Cl and atomic number 17. Chlorine supplies the chloride ions paired with copper.
Chloride: Chloride is the negatively charged ion Cl⁻, formed when chlorine gains one electron. Chloride balances copper’s charge and can bind directly to copper in solution.
Deacon process: The Deacon process produces chlorine by oxidizing hydrogen chloride with oxygen over a catalyst. Copper chloride catalysts can promote this industrial route to chlorine.
Copper(II) bromide: Copper(II) bromide is a copper(II) salt with formula CuBr₂. Replacing chloride with bromide changes the halide while retaining copper’s +2 state.
Copper etching: Copper etching is the selective chemical removal of copper from a surface or pattern. CuCl₂-based etchants provide a practical example of its reactions with metallic copper.

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