Electrometric Titration of Chloride in Small Volumes

Abstract

ABSTRACT The potentiometric end-point in the titration of chloride with silver nitrate depends upon the fact that the concentration of Cl- ions determines the potential of a silver wire coated with silver chloride which dips into the titration vessel. This chloride electrode is connected through a voltmeter with a reference electrode which completes the circuit, and when the end-point is reached there is a very rapid change of potential between the electrodes, of the order of 100 mV or more. This method is not only convenient but also promises to be practicable on the micro-scale where there is insufficient thickness of solution for the colour change of an indicator to be perceptible.