Question

describe the electroplating of copper on an iron strip ? please answer in short

Answer 1

The copper sulphate solution has copper metal in the dissolved form.The copper sulphate solution consists of free positively charged copper ions and negatively charged sulphate ions. when electric current is passed through copper sulphate solution ,then the following changes takes place :

1)The dissolved copper metal present in the copper sulphate solution as positively charged copper ions gets attracted to the negatively charged electrode iron key. The positively charged copper ions lose their positive charge on coming in contact with the negatively charged Ion key and from copper atoms.These copper atoms deposit on the iron key to form a thin layer of copper metal all over the surface of iron key.In this way, copper metal in the electrolyte comes out of the solution and forms a thin layer on the iron key.

2)The copper metal of positively charged copper plate electrode dissolves by forming positively charged copper ions.The copper ions thus formed go into the copper sulphate solution. In this way the loss of copper ions from copper sulphate solution is made up and the process continues. Since the copper ions are taken out from the solution at the negative electrode but put into solution at the positive electrode therefore the concentration of copper sulphate solution remains constant.

During copper plating of an iron key, copper metal is transferred from the copper plate to the iron key through the copper sulphate solution.During electroplating with copper, copper metal gets transferred from positive electrode to the negative electrode.




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