Solubilities of schoepite with hypochlorite ion in 0.1 Μ NaCl solution were measured by Potentiometrie titration method at 25.0 °C, under C0 2 -free atmosphere. Compared with its solubility in the absence of hypochlorite ion, it has been found that hypochlorite ion enhanced its solubility up to 100 times in the neutral pH range. The appearance of a shoulder at 311 nm in UV-Vis spectra indicated the presence of a new chemical species, which might affect on the solubility of schoepite in solution. Furthermore, changes in its solubility at pH 8.3 and in the vibrational frequency (v 3 ) for asymmetric stretching mode of U-Ο double bond at different molar ratios of hypochlorite ion to uranyl ion concentration provided an experimental evidence that a new chemical species was formed with hypochlorite ion. X-ray diffraction patterns for the residual precipitates also showed three different diffraction angles, which is resulted from the introduction of hypochlorite ion in precipitates.