Precipitation and complex formation titration:

A huge number of coulometric titrations have been developed in the literature along with the anode generation of Ag⁺ ions. The producing electrode consists of a heavy silver wire and a cell of the category shown in Figure of Unit 5 can be used. Endpoint could be detected either with adsorption indicators or through the potentiometry. The above method is extremely good for bromide and iodide as their solubility are much lower than KAgCl, therefore case of Cl-, 25-50% of ethenol is must be added to lower the solubility of AgCl.

Chloride, bromide and iodide are best denote along with Hg (I) produced with 100 % effectiveness from mercury- coated gold or from mercury pool anode. The endpoint is determined potentiometrically.  Within the titration of chloride ion addition of methanol (upto 70-80%) is necessary in sequence to reduce the solubility of mercury (I).