Abstract
Abstract The phase diagram of the system sulfuric acid-water in the range 80-100 mol % H20 was reinvestigated by low-temperature DTA and X-ray powder diffraction. The results are compared with other studies in the literature. The crystal structures of the hydrates H2SO4 · 6.5 H2O. melting incongruently at -54 °C. and H2SO4 · SH2O (metastable) were determined to be those of oxonium salts. (H5O2)(H7O1)SO4 ·1.5 H2O and (H5O2)2SO4 · 4 H2O, respectively.
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