## 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, Δ_{sol}H_{m}(T = 295.73 K; m = 0.0622 mol • kg ^{-1}) = (17.83 ± 0.50) kJ • mol^{-1}; cesium bromide, Δ_{sol}H_{m}(T = 293.99 K; m = 0.0238 mol • kg^{-1}) = (26.91 ± 0.59) kJ • mol^{-1}; cesium nitrate, Δ_{sol}H_{m}(T = 294.68 K; m = 0.0258 mol • kg^{-1}) = (37.1 ± 2.3) kJ • mol^{-1}; cesium sulfate, Δ_{sol}H_{m}(T = 296.43 K; m = 0.0284 mol • kg^{-1}) = (16.94 ± 0.43) kJ • mol^{-1}; cesium formate, Δ_{sol}H_{m}(T = 295.64 K; m = 0.0283 mol • kg^{-1}) = (11.10 ± 0.26) kJ • mol^{-1} and Δ_{sol}H_{m}(T = 292.64 K; m = 0.0577 mol • kg ^{-1}) = (11.56 ± 0.56) kJ • mol^{-1}; and cesium oxalate, Δ_{sol}H_{m}(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.

Original language | English |
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Pages (from-to) | 152-157 |

Number of pages | 6 |

Journal | Journal of Chemical Thermodynamics |

Volume | 38 |

Issue number | 2 |

DOIs | |

State | Published - 1 Jan 2006 |

## Keywords

- Cesium salts
- Molar enthalpies of vapourization and solution
- Osmotic coefficients
- Saturated solutions
- Vapour pressures
- Water activities