Re: Electrolysis of CuSo4 - observation

This is definately a strange observation that you observed. There is no 
chemical or electrical reason why the Copper would deposit on one side and 
not the other. However, I do have some ideas as to why this may have 
occured. First, the copper must be clean for the plating to occur 
properly. If only one side of your electrode plate had been cleaned then 
that is where the copper would be deposited. The other reason I could 
think of is if there were some type of masking film placed on one side of 
your electrode. I have seen thin, transparent films placed on metals to be 
plated in order to create intricate designs, so I would go back and make 
sure that there is no thin plastic film on one side of your electrode, 
much like you would find on the display of electronics when you purchase 
them.