Be careful: If solid copper chloride (or any other metal )is dissolved in water it forms the aqueous [Cu(H2O)6 ]2+ complex and not the chloride [CuCl4 ]2- complex
Addition of conc HCl to aqueous ions of Cu and Co lead to a change in coordination number from 6 to 4. write out the equations for both and name colours
example
Addition of a high concentration of chloride ions (from conc HCl or saturated NaCl) to an aqueous ion leads to a ligand substitution reaction.
