explain why the negative terminal of the battery must be connected to the cathode of the cell.
(may be broke/outdated!)
explain why the negative terminal of the battery must be connected to the cathode of the cell.
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One Response
Michael Faraday defined the cathode as the electrode to which cations flow (positively charged ions, like silver ions Ag+), to be reduced by reacting with (negatively-charged) electrons on the cathode. Likewise he defined the anode as the electrode to which flow anions (negatively charged ions, like chloride ions Cl-), to be oxidized by depositing electrons on the anode.
An electolytic cell is used to refine metals, such as the silver mentioned above, so the cathode must be supplied with electrons to reduce the cations to neutral charge.