IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with Uranyl nitrate hexahydrate and Water

Components:
   (1) Nitromethane; CH3NO2 ; [75-52-5]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (3) Uranyl nitrate hexahydrate; UO2(NO3)2×6H2O; [13520-83-7]  NIST Chemistry WebBook for detail

Original Measurements:
   Warner, R. K.; Aust. J. Appl. Sci. 4, 427-43 (1953).

Variables:
   Temperature = 293 K

Prepared By:
   V. P. Sazonov

Experimental Data:   (Notes on the Nomenclature)

Table 1. Uranyl nitrate distribution between nitromethane-rich and water-rich phases
t/°C	T/K	Mass Fraction w₂	Comment(s)
20.0	293.2	0.333	water-rich phase
20.0	293.2	0.414	water-rich phase
20.0	293.2	0.453	water-rich phase
20.0	293.2	0.513	water-rich phase
20.0	293.2	0.538	water-rich phase
20.0	293.2	0.003	nitromethane-rich phase
20.0	293.2	0.012	nitromethane-rich phase
20.0	293.2	0.026	nitromethane-rich phase
20.0	293.2	0.083	nitromethane-rich phase
20.0	293.2	0.132 (a)	nitromethane-rich phase

Table 2. Effect of ammonium nitrate on distribution of uranyl nitrate between Nitromethane-rich and water-rich phases
t/°C	T/K	Mass Fraction w₂	w2 Note	Comment(s)
20.0	293.2	0.060	(a)	water-rich phase
20.0	293.2	0.137	(a)	water-rich phase
20.0	293.2	0.278	(a)	water-rich phase
20.0	293.2	0.381	(a)	water-rich phase
20.0	293.2	0.468	(a)	water-rich phase
20.0	293.2	0.470	(a)	water-rich phase
20.0	293.2	0.012	(a)	nitromethane-rich phase
20.0	293.2	0.025	(a)	nitromethane-rich phase
20.0	293.2	0.064	(a)	nitromethane-rich phase
20.0	293.2	0.122	(a)	nitromethane-rich phase
20.0	293.2	0.215	(a)	nitromethane-rich phase
20.0	293.2	0.221 (b)	(a)	nitromethane-rich phase

Table 3. Effect of nitric acid concentration on distribution of uranyl nitrate Between nitromethane-rich and water-rich phases at 20 °C
Chemical Name	Mass Fraction w₂	Comment(s)
10 mL water + 10 mL CH3NO2	0.538	water-rich phase, two liquid phases
10 mL 1.0 N HNO3 + 10 mL CH3NO2	0.513	water-rich phase, two liquid phases
10 mL 2.5 N HNO3 + 10 mL CH3NO2	0.485	water-rich phase, two liquid phases
10 mL 5.0 N HNO3 + 10 mL CH3NO2	0.425	water-rich phase, two liquid phases
10 mL 10 N HNO3 + 10 mL CH3NO2	-	water-rich phase, one liquid phase
10 mL 15 N HNO3 + 10 mL CH3NO2	-	water-rich phase, one liquid phase
10 mL water + 10 mL CH3NO2	0.132 (a)	nitromethane-rich phase, two liquid phases
10 mL 1.0 N HNO3 + 10 mL CH3NO2	0.150 (a)	nitromethane-rich phase, two liquid phases
10 mL 2.5 N HNO3 + 10 mL CH3NO2	0.181 (a)	nitromethane-rich phase, two liquid phases
10 mL 5.0 N HNO3 + 10 mL CH3NO2	0.255 (a)	nitromethane-rich phase, two liquid phases
10 mL 10 N HNO3 + 10 mL CH3NO2	0.354 (a)	nitromethane-rich phase, two liquid phases
10 mL 15 N HNO3 + 10 mL CH3NO2	0.407 (a)	nitromethane-rich phase, two liquid phases

Notes:
   Table 2  ^a  Saturated with ammonium nitrate.
   Table 2  ^b  All systems saturated with UO₂(NO₃)₂·6H₂O.
   Table 3  ^a  All systems saturated with UO₂(NO₃)₂·6H₂O.

Method/Apparatus/Procedure:
   The analytical method was used. The equilibrium procedure for determining the distribution curve has been reported in Warner.¹ To obtain the final point on each curve, the system was saturated with (2) by agitation in the presence of excess solid for periods up to 8 to 10 hrs before sampling. After sampling each phase, the system stood overnight at 20 °C. The following day the system was intermittently agitated for a further 2 hr and the phases analyzed for (2) content to ensure saturation had been reached. The thorium concentration was derminted by evaporation of weighted aliquots, followed by ignition to thorium dioxide.

Source and Purity of Materials:
   (1) Source not specified; purity not specified; distilled.
   (2) Source not specified; purity not specified; purified as described in Warner.
   (3) Redistilled.

Estimated Errors:

   Temperature: control to ± 0.1 K.

References:
   ¹R. K. Warner, Aust. J. Appl. Sci. 3, 156 (1952).