An Interpretation of the End Point Error in the Potentiometric Titration of Bromide and Chloride Mixtures with Silver Nitrate

Abstract

Factors influencing the bromide end point error in the titration of bromide and chloride mixtures have been investigated. Adding sufficient electrolyte to flocculate silver bromide as it is formed reduces error to a minimum. With equimolar amounts of bromide and chloride this minimum error is

Thin Layer Potential Scan Coulometry. Determination of Metal Ions and of Halide Ions Using a Mercury-Coated Platinum Electrode.

“…In this condition, the electrode may still transfer electons, as shown by Kuwana and Adams' study of organic oxidations at the mercurous chloride film anode (15). Those authors observed that an Hg2Cl2 film 20 A. thick was sufficient to The Br~-Cl~interference is probably caused by solid solution formation, as in the case of the silver halides where some improvement has been made by altering solution conditions (6). The mercurous halides have isomorphous, tetragonal structures {27), and mixed crystals of Hg2Cl2-Hg2Br2 have been prepared by the addition of mercurous nitrate solution to solutions of various KC1: KBr ratios {26).…”