The solubility of lithium hydrogen fluoride between 0 and 40°has been established, and zinc fluoride, magnesium fluoride and calcium fluoride have been shown to be very insoluble. Potassium iodide has been found to react with liquid hydrogen fluoride. Chromium fluoride was found quite soluble but to an undetermined extent. These solubilities refer to liquid hydrogen fluoride as a solvent.2. Comparison of these results indicates a fair similarity in the solvent action of water and hydrogen fluoride for the salts tried.
The kinetics of the decomposition of the carbonato-tetrammine-cobaltic ion [Co(NH3)4C03] + + 2H + + H20 5=t [Co(NH3)4(H20)2]+++ + C02 have been studied in glycolate and acetate buffer solutions at 25°and at different salt concentrations.In the glycolate buffers the decomposition was practically complete. In some acetate buffers it could be shown that the reaction is balanced.When the carbon dioxide pressure is low and the hydrogen-ion concentration not too small, the velocity may be expressed as the sum of two terms, one being independent of the hydrogen-ion concentration, the other being proportional to the hydrogen-ion concentration. No general acid catalysis was found.
The proportion of pyrosulfate used in the fusion mixture and the time of heating have little or no effect on the solubility of the product formed.2. Coned, sulfuric acid is a more effective differentiating solvent for the tantalum and columbium than hydrofluoric acid.3. A complete separation of tantalum and columbium may be Obtained with coned, sulfuric acid if the fusion has been made at 835-875°.4. The solution of columbium is unaffected by cold 6 N sulfuric acid but is almost completely precipitated in a hot solution.5. The compounds formed by the fusion are probably tantalates and columbates rather than sulfates or double sulfates.6. A method of procedure is given for the separation of tantalum and columbium.
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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