Chapter 23 - Transition Metals Chemistry and Coordination Compounds - Questions & Problems - Page 1022: 23.43

The green precipitate is $CuF_{2}$ When $KCl$ is added, the bright green solution is due to formation of $CuCl_{4}^{2-}:$ $Cu^{2+}(aq) + 4Cl^{-}(aq) -> CuCl_{4}^{2-}(aq)$

The green precipitate is $CuF_{2}$ When $KCl$ is added, the bright green solution is due to formation of $CuCl_{4}^{2-}:$ $Cu^{2+}(aq) + 4Cl^{-}(aq) -> CuCl_{4}^{2-}(aq)$