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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.
straight. aluminum wire into the test tube containing the copper(II) chloride solution. 6. Place the test tube in a boiling water bath (1 L beaker containing about 800 mL of boiling water on a hot plate set to high) for about 10 to 15 minutes.The reaction is complete when the solution becomes colorless.. Use a small piece of steel wool to shine a 16 - 18 cm piece of aluminum wire to remove any surface impurities. Do this on some paper towel (not on the lab table/counter, please!). Be careful of the wireâs sharp edges. The safest way to clean the wire is to brush it on a flat surface away from your body.