What happens when Ammonia is added to an (aq) solution of copper II chloride?

$\ce{CuCl2 + NH3 ->\; ?}$

I know that ligands bond with metals to form ion but I'm not sure about how they work in a reaction.


1 Answer 1


When solid $\ce{CuCl2}$ is dissolved in water, aquo complexes are formed.

$\ce{CuCl2_{(s)} + H2O -> [Cu(H2O)6]^2+ + 2 Cl-}$

Addition of ammonia results in a ligand exchange reaction to give tetrammine complexes.

$\ce{[Cu(H2O)6]^2+ + 4 NH3 -> [Cu(NH3)4(H2O)2]^2+ + 2 H2O}$

  • $\begingroup$ I get how NH3 as a ligand replaces (H2O)6 but how did you come uo with the products? [Cu(NH3)4(H2O)2]^2+ + 2H2O Thanks. $\endgroup$
    – user114027
    Commented Feb 22, 2014 at 4:42

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