An improved potentiometric method for determination of chloride ions with mercuric nitrate is described. Silver-silver chloride electrode is used as the indicating electrode while the reference electrode is a silver-electrode, immersed i,n 0.1 N silver nitrate solution. The addition of an amount of ethyl alcohol, which equals to 74% of the total volume of solution at the end of titration, is advocated. Satisfactory results are obtained. Variations in concentration of mercuric chloride at the end point and pH of solution have no effect on titration results. Owing to the fact that no precipitate is formed during the titration, this method is easier to carry out than the argentometry.