Anode and Cathode


Q. Why anode has positive and Cathode has negative charge in electrolytic cell while Anode is negative and Cathode is positive in Voltaic cell?

Ans:    Because anode material oxidizes and gives its electrons to anode which makes it negative while cathode is surrounded by positively charged ions of the electrolyte and these positive charges are reduced by the electrons coming from the anode side through the external circuit. Cathode is electron deficient due to these positive ions surrounding the electrode and thus it is positive.
In electrolytic cell, the electrode which is connected to the positive terminal of the battery is anode having positive charge while the electrode which is connected to the negative terminal of the battery is cathode having negative charge. The charges on the electrodes are due to the battery.

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