Thermodynamics of aqueous NH4Br solutions over wide ranges of concentrations and temperatures

The enthalpies of solution and dilution of aqueous solutions of NH 4 Br at electrolyte concentrations lower than 6 mol/kg solvent are measured at 277 and 288 K. The generalized equation for the enthalpy as a function of concentration and temperature is derived using the data for 298 and 313 K. The thermodynamic properties of NH 4 Br solutions at concentrations up to saturated solutions and at temperatures of 273, 298, 323, and 348 K are discussed.