Abstract
A comparative study has been made of the use of silver iodate, mercurous iodate and mercuric iodate for the determination of the chloride ion on the micro scale. The principle of the method is that the sparingly-soluble iodate reacts with the chloride ion to produce an equivalent amount of iodate ion. After filtration of the solution the iodate ion is titrated iodometrically, a six-fold amplification of titre being obtained. All three of the reagents give results of similar accuracy. Mercuric iodate is slightly superior in this respect to the other two reagents, but has the disadvantage that it cannot be used in acidic solutions. The results obtained are very reproducible, but deviate up to two per cent from the theoretical, depending upon the chloride ion concentration in the range 0.7–3.5 mg.
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