During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment
During the electrolysis of copper using platinum electrode, Cu and H migrate to the cathode while,SO\(_4\) and OH migrate to the anode.CU is then discharged preferentially at the cathode, acquiring two electrons and is deposited as metallic copper, while OH is discharged preferentially at the anode and deposited as gaseous oxygen, then the SO\(_4\) and H still in the solution react, thereby making d solution acidic and then changing the litmus paper red which is the test for acids.
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