Publication costs assisted by Laboratoire de Chimie Physique, UniversitB de BordeauxThis study using several different methods, vix., infrared, Raman, and iimr spectroscopy, dipole moment, and depolarized Rayleigh scattering measurements, and IXDO calculations, suggests that the RDX molecule has approximate Csu symmetry in solution, with some distortion associated with the NO2 groups. The ring undergoes rapid interconversion in which the cyclic nitrogens oscillate about the planar (sp2) position.The electromotive force of the cells AgIKHdN03, HtO, AgN031/NH4M03, HzO, AgN03, NH4ClIiig as a function of the concentrations of water, silver nitrate, and ammonium chloride has been measured at a temperature of 110'. Association constants of the silver ion with the chloride ion were calculated to vary between 2580 and 1760 (mol/mol of nitrate)-l for molar ratios of water to ammonium nitrate ranging between 0.4 and 1.4. The results are discussed in terms of a quasi-lattice model for highly concentrated aqueous solutions.