At the cathode Again, copper is formed, and coats the electrode,
while the anode dissolves, giving copper ions in solution, so this time, the electrodes are not inert. The anode dissolves, giving copper ions. These move to the cathode, to form copper, so copper moves from the anode to the cathode. The color of the solution does not fade.
The anode is made of impure copper. The cathode is pure copper.
The electrolyte is dilute copper(II) sulfate solution.
The copper in the anode dissolves, But the impurities do not dissolve,they just drop to the floor of the cell as a sludge.
A layer of pure copper builds up on the cathode, When the anode is
almost gone, the anode and cathode are replaced.
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