sentence: Copper is made pure by electrolyzing it.
sentences_after: A thin sheet of pure copper is put on the cathode and a thick sheet of impure copper is put on the anode. The electrolyte is copper sulfate. The impure copper gets dissolved in the solution. It then coats the thin sheet of pure copper. This makes the copper pure.
concept_name: copper
headings: Copper Preparation
categories: Chemical elements Metals