Copper(II) Chloride production

[The Count of Monte Cristo]

I am currently trying to produce a small sample of Copper(II) Chloride, I cut up a 5g segment of copper wire and placed it in stoichiometric amounts of HCl and H₂O₂. In order to help the reaction along I put the beaker (now covered to prevent the escape of any reactants) containing my reactants on a hotplate at a low temp. At this point the reaction seems to have slowed, quite unfinished, to a stop. Where did I go wrong? I suspect that the heat of the hotplate decomposed the peroxide but I'm not sure.