IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with Argon and Water

Components:
   (1) Nitromethane; CH3NO2 ; [75-52-5]  NIST Chemistry WebBook for detail
   (2) Argon; Ar; [7440-37-1]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Friedman, H. L.;J. Am. Chem. Soc. 76, 3294-7(1954).

Variables:
   Temperature = 298 K

Prepared By:
   V. P. Sazonov

Experimental Data:   (Notes on the Nomenclature)

Solubility of argon in mixtures of nitromethane and water
t/°C	T/K	Chemical Name	Ostwald coefficient, L /dimensionless	Comment(s)
24.85	298.00	H2O	0.0342, 0.0338	0.0340 Avg.
24.85	298.00	H2O saturated with CH3NO2 (a)	0.0317, 0.0317	0.0317Avg.
24.85	298.00	CH3NO2 saturated with H2O (a)	0.139, 0.141	0.140 Avg.
24.85	298.00	CH3NO2	0.138, 0.146, 0.146	0.143 (b) Avg.

Notes:
   Table 1  ^a  Composition of water saturated nitromethane-saturated water solutions not specified.
   Table 1  ^b  Recorded as 0.145 on original. Value corrected by compiler.

Method/Apparatus/Procedure:
   The method was essentially that employed by Eucken and Herzberg.¹ The solvent was degassed by alternately opening to the vacuum pump for 5 to 15 sec. and then stirring very rapidly to produce cavitation. This was repeated 5 to 10 times. In the solubility measurement itself, gas which had been previously saturated with solvent vapor, was admitted to the saturation vessel, holding about 80 mL of soln., and with 5 to 10 mL remaining space, and volume-time measurements were taken and extrapolated back to the time the gas was admitted. Then the stirrer was turned on and driven very fast, producing a slightly (~1%) supersaturated solution. The approach to equilibrium was then followed from each direction while stirring as rapidly as possible without producing cavitation and bubbles.

Source and Purity of Materials:
   (1) Source not specified; purity not specified; redistilled and dried by filtering at -20 °C.
   (2) Linde Air Products; spectro grade.
   (3) Conductivity water.

Estimated Errors:
   Solubility: relative error of 2-3 determinations less than 3 %.

References:
   ¹A. Eucken and C. Herzberg, Z. Phys. Chem. (Leipzig) 195, 1 (1950).