In controlled cathode potential electrolysis the third electrode is used as
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=> In a controlled potential electrolysis (CPE) experiment, the working electrode is held at a constant potential until the solution is exhaustively electrolyzed.
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Electrogravimetry is a method used to separate and quantify ions of a substance, usually a metal. In this process, the analyte solution is electrolyzed. Electrochemical reduction causes the analyte to be deposited on the cathode. The mass of the cathode is determined before and after the experiment, and the difference is used to calculate the mass of analyte in the original solution. Controlling the potential of the electrode is important to ensure that only the metal being analyzed will be deposited on the electrode.
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