If pure water is used in a electrolytic cell, current does not flow
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Explanation:
Electrolysis of pure water requires excess energy in the form of overpotential to overcome various activation barriers. Without the excess energy the electrolysis of pure water occurs very slowly or not at all. This is in part due to the limited self-ionization of water. Pure water has an electrical conductivity about one millionth that of seawater.
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Current does not flow in pure water.
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