IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Benzene with Deuterium oxide (heavy water)
Components:
   (1) Benzene; C6H6; [71-43-2]  NIST Chemistry WebBook for detail
   (2) Deuterium oxide (heavy water); D2O; [7789-20-0]  NIST Chemistry WebBook for detail
Original Measurements:
   Ben-Naim, A.; Wilf, J.; Yaacobi, M., J. Phys. Chem. 1973, 77, 95-102.

 Variables:
   Temperature = 10-50 °C

 Prepared By:
   G.T. Hefter

 Experimental Remarks:
   The solubility of benzene in heavy water is reported in terms of the standard free energy of solution, deltamus, determined as:

     deltamus = lim(rhosarrow O) [-RT ln(rhols/rhogs)eq]

where (rhols/rhogs)eq is the Ostwald absorption coefficient and rhols and rhogs are respectively the molar concentrations of the solute s in the liquid and the gas phase at equilibrium.

For the temperature range studied, delta mu °s was fitted to a second degree polynomial of the form:

      delta mu °s = -10657.5 + 44.618 t - 0.03864 t2

where t is in °C (10 < t < 50°C) and delta mu°s is in cal/mol (1 cal = 4.187 J)

Values of the Ostwald absorption coefficient are also reported.

 Experimental Data:   (Notes on the Nomenclature)
   Method/Apparatus/Procedure:
   Solubilities were determined spectroscopically. Saturated solutions were prepared in two ways: (a) direct mixing of benzene and water for a. 48 h, (b) dissolution of benzene through the vapor phase. Absorbances of the solutions and their vapors were measured directly at wavelengthmax with a Model 450 Perkin-Elmer spectrophotometer with a thermostatted cell holder. Establishment of equilibrium was checked by use of a special three compartment cell, details of which are given in the paper.

 Source and Purity of Materials:
   (1) Fluka, puriss, 99.94%, used as received.
   (2) Fluka, 99.75%, used as received.

 Estimated Errors:
   Solubility: std. Dev. In delta ms°, 15.103 cal/mol.
   Temperature: 0.05°C