Abstract
Glass electrode serves as the reference electrode even in the presence of organic solvent, containing potassium hydrogen phthalate as an indifferent electrolyte.
The effect of various organic solvents and their concentrations on the argentimetric titration of halogens in solvent mixtures has been investigated by potentiometric titration with a silver indicator electrode and a glass reference electrode. By using isopropanol as the solvent of the standard, and aqueous acetone as that of the sample, the sensitivity of chloride determination has been increased four to ten times, comparing with that in the conventional aqueous titrations. The sensitivity for bromide is increased two to three times, but that for iodide only slightly.
Two halogens contained in a sample can be determined separately with high accuracies by a new method, in which the one in the sample is titrated as usual in the aqueous solution, and the other is then titrated in succession after adding plenty of acetone in the sample solution.
