The molar enthalpies of solution and vapour pressures of saturated aqueous solutions of some cesium salts |
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| Institution: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. Faculty of Information Science and Engineering, Ningbo University, Ningbo 315211, China;4. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Vapour pressures of water over saturated solutions of cesium chloride, cesium bromide, cesium nitrate, cesium sulfate, cesium formate, and cesium oxalate were determined as a function of temperature. These vapour pressures were used to evaluate the water activities, osmotic coefficients and molar enthalpies of vapourization. Molar enthalpies of solution of cesium chloride, ΔsolHm(T = 295.73 K; m = 0.0622 mol · kg?1) = (17.83 ± 0.50) kJ · mol?1; cesium bromide, ΔsolHm(T = 293.99 K; m = 0.0238 mol · kg?1) = (26.91 ± 0.59) kJ · mol?1; cesium nitrate, ΔsolHm(T = 294.68 K; m = 0.0258 mol · kg?1) = (37.1 ± 2.3) kJ · mol?1; cesium sulfate, ΔsolHm(T = 296.43 K; m = 0.0284 mol · kg?1) = (16.94 ± 0.43) kJ · mol?1; cesium formate, ΔsolHm(T = 295.64 K; m = 0.0283 mol · kg?1) = (11.10 ± 0.26) kJ · mol?1 and ΔsolHm(T = 292.64 K; m = 0.0577 mol · kg?1) = (11.56 ± 0.56) kJ · mol?1; and cesium oxalate, ΔsolHm(T = 291.34 K; m = 0.0143 mol · kg?1) = (22.07 ± 0.16) kJ · mol?1 were determined calorimetrically. The purity of the chemicals was generally greater than 0.99 mass fraction, except for HCOOCs and (COOCs)2 where purities were approximately 0.95 and 0.97 mass fraction, respectively. The uncertainties are one standard deviations. |
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