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Electrolysis
 
This model illustrates the processes that occur at the molecular level during CuCl2 solution electrolysis. Copper chloride exists in solution as separate hydrated ions of chlorine and copper (similar to chlorine and sodium ions in the model "NaCl dissolving"). When voltage is applied to the electrodes, positive copper ions start to move towards the negative electrode (cathode) and negative chlorine ions move towards to the positive electrode (anode). Upon reaching the cathode, copper ion receives two electrons from it, and becomes a neutral copper atom, which deposits at the cathode. When a chlorine ion reaches the anode, it gives the extra electron to the anode.
Note that the neutral chlorine atoms accumulating in the vicinity of the anode become bubbles of gaseous chlorine leaving the vessel (in this model, this last stage is shown schematically).

 
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