Pressure dependence of the solubility of nitrogen, argon, krypton, and xenon in water

Autor:	Gerald L. Pollack, Richard P. Kennan
Rok vydání:	1990
Předmět:	Aqueous solution Argon Krypton Analytical chemistry General Physics and Astronomy Noble gas chemistry.chemical_element Partial molar property Nitrogen Xenon chemistry Physical chemistry Physical and Theoretical Chemistry Solubility
Zdroj:	The Journal of Chemical Physics. 93:2724-2735
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.458911
Popis:	Measurements are reported for the pressure dependence of the Ostwald L and mole‐fraction x2 solubilities for nitrogen, argon, krypton, and xenon in water at 25.0 °C. The approximate pressure ranges were: N2, 44–116 atm; Ar, 22–101 atm; Kr, 33–81 atm; and Xe, 5–48 atm. Our experimental technique is a modified Van Slyke method which allows the simultaneous determination of L, x2, and partial molar volume v2 of the solute gas in the solvent. For N2, Ar, and Kr we observe deviations from Henry’s Law, f2=kHx2 which vary linearly with pressure. For example, the measured values of Henry’s constant range from kH (25 °C, 44.6 atm)=90 269 atm to kH (25 °C, 115.8 atm)=100 340 atm for N2 in water. Extrapolation of the data to low pressure yields results for L and x2 which agree with literature values. For Xe we observe a sharp increase in Henry’s constant at pressures above 20 atm. The measured partial molar volume also changes sharply from 47 to ∼125 cm3/mol. This is attributed to the observed onset of ice‐like clat...
Databáze:	OpenAIRE
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