Copper(II) chloride

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Copper(II) chloride crystals and saturated solution.

Copper(II) chloride (CuCl2) is copper chloride with the copper ion in oxidation stage 2+. The other copper chloride salt is copper(I) chloride.

Copper chloride is the central chemical in the copper chloride process of leaching base metals. CuCl2 can dissolve copper by CuCl2 + Cu => 2CuCl

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Dissolving palladium

CuCl2 is also able to dissolve palladium, forming palladium(II) chloride in the following reaction.
Pd + 2CuCl2 → 2CuCl + PdCl2
This reaction is part of the Wacker process.

Color of water solutions

The color of CuCl2 varies depending on concentration.

  • Diluted CuCl2 forms blue (Cu(H2O)6)2+
  • Semi-concentrated CuCl2 forms green (CuCl2(H2O)4)
  • Concentrated CuCl2 forms green-brown (CuCl4)2-

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