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#2. Re: How to un-solder copper joints. heat the joint up till you see the solder is liquid then pull and twist the pipe from the fitting. When you re-install a new piece of pipe heat the fitting to re-soften the solder, flux pipe to be inserted and push it back in as you heat the fitting and re-apply a bead of solder.e: How to un-solder copper joints. You are going to have better luck with propper equipment and material. For under 1-1/2. I use a turbo-torch stk-9 with mapp gas.
Measure 15 mL of copper (II) chloride using a 25 mL graduated cylinder. Pour the solution in a test tube. [The solution is blue.]. Use tweezers to lower the aluminum wire into the test tube contain the copper (II) chloride solution.The wire will extend beyond the height of the tube. Place the test tube into the boiling water bath for approximately 5 â 10 minutes. The reaction is complete when the solution becomes colorless.inse the aluminum wire with tap water and dry the wire with a paper towel. Once dry, measure and record the actual âleftoverâ mass of the aluminum wire in the data table. Dispose the used aluminum wire by rolling into a ball (to eliminate sharp ends) and place in the trash.