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Regarding formation of Copper(I) complex

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I understand that copper(II) chloride reacts with copper metal in conc. HCl to eventually produce colourless [CuCl2]-. Can anyone tell me what is the role of copper in this reaction? I'm also wondering how do you get a balanced equation out of all that. Thanks much.

The copper metal is a one electron reductant

 

The equation

 

Cu +CuCl2 +2Cl- --> 2 [CuCl2]-

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