Impure metal should be made the anode and pure metal should be made the cathode. Why would the anode corrode and become thinner?
Due to oxidation and reduction half-equations.
Whether we discuss the galvanic cell or the electrolytic cell, the phenomenon is the same.
You should know that always oxidation reaction occurs on the anode and the reduction reaction occurs at the cathode.
Let us discuss the example of a galvanic cell where Aluminum (
From the half-equations we can notice that we are consuming
Here is a video that explains the particulate representation of what occurs during the operation of a galvanic cell: