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Conductometric estimation of thorium in dilute thorium chloride
Authors:P G Menon and D Singh
Institution:(1) Department of Chemistry, Banaras Hindu University, Banaras, India;(2) Present address: Van der Waals Laboratorium, Gemeente Universiteit, Amsterdam, Netherlands
Abstract:Summary Conductometric titrations of thorium chloride against oxalic acid, ammonium oxalate and silver nitrate have been carried out at high dilutions (0.001, 0.0005 and 0.00033 M) of the chloride. Oxalic acid is found to be a suitable titrant for rapid estimation of thorium, the minimum error being +0.5%. The other titrants do not give good results. The titrations with ammonium oxalate indicate the step-wise ionisation of ThCl4 into ThCl2 2+, ThCl3+ and Th4+. For mixtures of thorium chloride and cerous chloride, only the equivalence point corresponding to complete precipitation of both thorium and cerium is indicated.The authors express their sincere thanks to Prof. S. S.Joshi for his keen interest in this work and to Dr. G. S.Deshmukh for his advice and help in so many ways during the progress of these studies.
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