On the Volumetric Estimation of Metal Oxine.

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In the titration of hydrochloric acid solution of the metal oxine, the writer found that the amount of the bromate-bromide solution to be added is of vital importance to obtain the correct result. In the bromization of oxine with the bromate bromide solution, care should be taken not to add much excess of the solution, otherwise by subsequent addition of potassium iodide, insoluble iodine separates out together with a chocolate brown precipitate of an iodine addition product. After the back titration with thiosulphate, blue colour of the starch indicator returns again after standing the solution for a while and this is liable to give too high result in the analysis. The phenomenon can be explained by assuming that in the presence of dibromoxine, the solubility of iodine in potassium iodide solution is greatly diminished. The method, therefore, differs from an ordinary back titration, for the excessive bromate-bromide solution is restricted within comparatively narrow limit. In order to
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