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In a previous paper (Loureiro a This merely confirms a well-known fact on which there is a considerable literature (see McBride, 1912; We further ascertained that a closer agree- ment with theory is obtained when the reaction is carried out in strong acid solution and in the presence of added manganese sulphate. A solution containing 35% H2SO3 and 5% MnSO . 4H2O reacts with oxalic acid at room temperature and with KI in exactly equivalent proportions. This makes it possible to replace the usual titration to the 'pink end-point' by the more exact and sen- sitive iodometric estimation of unreduced perman- ganate through the iodide-thiosulphate reaction, or colorimetrically by means of a photoelectric colorimeter.
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Loureiro et al. (1944) studied this question.