Work in this Laboratory on solubilities in non-aqueous inorganic solvents has extended over several years and has included a large number of inorganic compounds. Such solvents as sulfur monochloride, liquid nitrogen tetroxide, thionyl chloride, liquid hydrogen fluoride and liquid sulfur dioxide have been investigated.1 The work with anhydrous liquid sulfur dioxide has shown that in general the metal iodides and thiocyanates are soluble to a small degree, while the chlorides and bromides are less soluble. Bond and Beach2 investigated the solubility of stannic chloride, stannic bromide, carbon tetrachloride and titanium tetrachloride in anhydrous liquid sulfur dioxide, and have found that these compounds form binary liquid systems at low temperatures with this solvent. They determined the nature of the systems formed by the first three of these compounds but their work with titanium tetrachloride was not completed. The present work had for its purpose the completion of the system formed by titanium tetrachloride and anhydrous liquid sulfur dioxide and the extension of the investigation to include the behavior of silicon tetrachloride and zirconium tetrachloride with this solvent.The method employed was first used by Alexjew.3 It consists in sealing a known quantity of solvent and solute in a small glass tube, rotating it in a bath with regulated variable temperature and noting the temperature at which the two phases become one.
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