As a study on the bromine-based thermochemical water decomposition cycles comprising the electrolytic decomposition of aqueous hydrogen bromide, the electric conductivities of the HBr2-H2O system were measured in the solutions containing 1∼11 mol kg-1 of HBr concentration and less than 1.5 mol kg-1 of Br2 concentration at 25, 35 and 50°C. The electric conductivities of hydrobromic acid are listed in Table 1, and their variations with HBr concentration and with temperature are shown in Fig.1. The densities of hydrobromic acid, as shown in Fig.2, were also measured at 25°C for the calculation of the relation between the molarity and the molality. The electric conductivities for the ternary system are given in Table 2, The effects of Br2 concentration on the conductivitis are shown in Fig.3 and in Fig.4.
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