Chromium(VI) oxidises thiosulphate with variable stoicheiometry to sulphate and tetrathionate. The main reaction at pH 4 proceeds essentially by the attack of S2O32– upon an intermediate CrS2O62–, spectroscopic evidence for whose formation is presented. A slower reaction operating through a different mechanism is the dominant one at pH 6.
M. I. Edmonds, K. E. Howlett and B. L. Wedzicha, J. Chem. Soc. A, 1970, 2866 DOI: 10.1039/J19700002866
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