In a potentiometric titration the equivalence point is detected by monitoring the electromotive force of an electrochemical cell formed by an indicator electrode coupled with a convenient reference electrode. The potential of the indicator electrode, and therefore the electromotive force of the cell, is a measure of the activity of the ionic species in the electrolyte solution. A potentiometric titration is provided on the iron (II)/cerium (IV) redox system with a solution of 0.1 molar iron sulphate (II) to determine the concentration of an unknown solution of iron (II).
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