Abstract
When titrating hydrosulphite with a neutral solution of ferric chloride, using a mixture of thiocyanate and ferrocyanide as indicator, a deep red coloration of ferric thiocyanate is observed near the end-point of the titration. At the final end-point the solution rapidly turns blue. By this means it is possible to titrate very rapidly and a slight excess of titrant is easily estimated. A preliminary titration gives the approximate quantity of iron to add in the final solution to which the solid hydrosulphite is to be added; as in the final titration there remain only minimal quantities of hydrosulphite, the error due to aerial oxidation is thus completely eliminated. Without the protection of an inert gas and without back-titration it is possible to obtain results with an error less than 0.1 %.
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