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Old Dec 8th 2017, 06:21 PM   #6
oz93666
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Electrolysis of pure hydrochloric acid with no corroding electrodes will give chlorine gas at the +ve anode and hydrogen gas at the cathode .

Using pure copper as electrodes , chlorine may react with the chlorine to a limited extent but this is pale blue ...

Any pure white deposit can only come from impurities either in the acid , or copper ..

I would try changing the electrodes to see if this effects results , the copper used in house wiring is pure.
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