Used for electroplating because it protects them from corrosion and improving their appearance.
Also used to purify metals, e.g. the purification of copper. For electrolysis to take place:
- the + electrode needs to be made of impure copper
- the - electrode needs to be made of pure copper
- the solution must contain copper ions
Consequently, the - electrode gets bigger and bigger, while the + electrode slowly dissolves away to nothing. The impurities of copper fall to the bottom of the container as the process takes place.
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