Titration of Small Amounts of Mustard and Other Gases with Bromine and Methyl Red. ∗

Abstract

Summary

Mustard (I), ethyldichlorarsine (II), Lewisite (III), and phenyldichlorarsine (IV) may be titrated with 10^-4 M bromine using methyl red as indicator. The method is accurate to about ± 0.02 ml 10^-4 M bromine per ml of solution titrated. The reaction of these compounds is that of one mole of bromine per mole of gas.