TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Electrolysis of copper sulphate. Glass beaker of copper sulphate solution (blue) into which two carbon electrodes (black) have been placed. The electrodes are connected to a power supply (not seen). Passing an electric current through copper sulphate separates the copper from the sulphur and oxygen. Here bubbles of oxygen can be seen at the negative electrode (cathode, right) and copper metal is beginning to be deposited on the positive electrode (anode, left).
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