Abstract
Aqueous bromine in the concentration range 10 -1–10 -6 M oxidizes thiosulphate quantitatively to sulphate. This reaction can be used to standardise very dilute bromine solutions by addition of a measured but insufficient quantity of relatively concentrated standard thiosulphate solution. The fall in bromine-bromide redox potential at an inert indicator electrode caused by the addition allows the final bromine concentration to be found. The method can be applied in the measurement of fast bromination kinetics.
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