IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with Formic acid and Water

Components:
   (1) Formic acid; CH2O2; [64-18-6]  NIST Chemistry WebBook for detail
   (2) Nitromethane; CH3NO2 ; [75-52-5]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Maslovskaya, N. V.; Dissertation, Kalinin University, 1974.

Variables:
   Temperature = 293 K and 313 K

Prepared By:
   V. P. Sazonov

Experimental Data:   (Notes on the Nomenclature)

Table 1. Mutual solubility of nitromethane, formic acid and water
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)
40.0	313.2	0.1000	0.0000	0.0318	0.0000
40.0	313.2	0.1340	0.0440	0.0450	0.0196
40.0	313.2	0.1796	0.0788	0.0642	0.0374
40.0	313.2	0.2130	0.1168	0.0807	0.0587
40.0	313.2	0.2890	0.1483	0.1208	0.0822
40.0	313.2	0.3240	0.1632	0.1423	0.0950
40.0	313.2	0.3582	0.1635	0.1632	0.0988
40.0	313.2	0.3860	0.1660	0.1818	0.1036
40.0	313.2	0.4330	0.1685	0.2158	0.1114
40.0	313.2	0.4880	0.1650	0.2593	0.1162
40.0	313.2	0.5460	0.1600	0.3113	0.1210
40.0	313.2	0.5660	0.1558	0.3300	0.1205
40.0	313.2	0.6200	0.1403	0.3832	0.1150
40.0	313.2	0.6800	0.1203	0.4486	0.1052
40.0	313.2	0.7510	0.0922	0.5347	0.0871
40.0	313.2	0.8340	0.0605	0.6559	0.0631
40.0	313.2	0.9600	0.0000	0.8763	0.0000

Table 2. Compositions of coexisting liquid phases
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)	Comment(s)
20.0	293.2	0.960	0.010	0.893	0.012	nitromethane-rich phase
20.0	293.2	0.924	0.028	0.822	0.033	nitromethane-rich phase
20.0	293.2	0.905	0.038	0.788	0.044	nitromethane-rich phase
20.0	293.2	0.890	0.045	0.761	0.051	nitromethane-rich phase
20.0	293.2	0.880	0.050	0.744	0.056	nitromethane-rich phase
20.0	293.2	0.855	0.061	0.701	0.066	nitromethane-rich phase
20.0	293.2	0.820	0.080	0.648	0.084	nitromethane-rich phase
20.0	293.2	0.785	0.093	0.594	0.093	nitromethane-rich phase
40.0	313.3	0.942	0.010	0.843	0.012	nitromethane-rich phase
40.0	313.3	0.900	0.030	0.765	0.034	nitromethane-rich phase
40.0	313.3	0.882	0.038	0.733	0.042	nitromethane-rich phase
40.0	313.3	0.877	0.040	0.724	0.044	nitromethane-rich phase
40.0	313.3	0.828	0.062	0.646	0.064	nitromethane-rich phase
40.0	313.3	0.813	0.068	0.622	0.069	nitromethane-rich phase
40.0	313.3	0.808	0.071	0.616	0.072	nitromethane-rich phase
20.0	293.2	0.108	0.030	0.035	0.013	water-rich phase
20.0	293.2	0.135	0.070	0.046	0.032	water-rich phase
20.0	293.2	0.159	0.101	0.057	0.048	water-rich phase
20.0	293.2	0.172	0.117	0.063	0.057	water-rich phase
20.0	293.2	0.196	0.143	0.074	0.072	water-rich phase
20.0	293.2	0.200	0.148	0.077	0.075	water-rich phase
20.0	293.2	0.240	0.178	0.098	0.096	water-rich phase
20.0	293.2	0.280	0.195	0.121	0.112	water-rich phase
40.0	313.3	0.137	0.041	0.046	0.018	water-rich phase
40.0	313.3	0.180	0.053	0.065	0.039	water-rich phase
40.0	313.3	0.250	0.130	0.099	0.068	water-rich phase
40.0	313.3	0.251	0.132	0.100	0.070	water-rich phase
40.0	313.3	0.296	0.154	0.125	0.086	water-rich phase
40.0	313.3	0.300	0.155	0.128	0.087	water-rich phase
40.0	313.3	0.324	0.163	0.142	0.095	water-rich phase

Method/Apparatus/Procedure:
   Two methods were used. The solubility curve was determined by the titration method. The analytical method was used, samples being withdrawn from coexisting liquid phases at equilibrium for analysis by refractometry.

Source and Purity of Materials:
   (1) Source not specified, pure grade reagent; distilled; b. p. = 101.0 °C; n(20 °C, D) = 1.3818, d(20 °C, 4 °C) = 1.1385.
   (2) Source not specified, pure grade reagent; distilled; b. p. = 105.0 °C; n(20 °C, D) = 1.3701, d(20 °C, 4 °C) = 1.2030.
   (3) Doubly distilled.

Estimated Errors:

   Temperature: Not reported.