IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with Octanoic acid and Water

Components:
   (1) Nitromethane; CH3NO2 ; [75-52-5]  NIST Chemistry WebBook for detail
   (2) Octanoic acid; C8H16O2; [124-07-2]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Sazonov, V. P.; Zh. Fiz. Khim. 45, 473-4 (1971). *Deposited Doc., VINITI 2282 (1970).

Variables:
   Temperature = 278 K to 304 K

Prepared By:
   V. P. Sazonov and N. V. Sazonov

Experimental Remarks:

   The temperatures of phase transitions were determined in ternary mixtures with a constant mass content of (3), respectively 1.25, 2.50, 3.75, 5.0, 10.0, 20.0, 40.0, and 70.0 mass %, and also in ternary mixtures with a constant mass relationship of (1) and (2), respectively, 45.0:55.0, 57.5:42.5, and 70.0:30.0. L₁ nitromethane-rich phase; L₂ acid-rich phase; L₃ water-rich phase. The phase which is being dissolved is indicated in the table.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Solubility temperatures of three liquid phases
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)
6.75 (L2)	279.90	0.7699	0.1926	0.7869	0.0833
8.65 (L2)	281.80	0.7218	0.2407	0.7592	0.1072
5.70 (L1)	278.85	0.3324	0.6176	0.4356	0.3425
6.75 (L2)	279.90	0.7593	0.1907	0.7522	0.0800
7.60 (L1)	280.75	0.3803	0.5697	0.4809	0.3049
8.65 (L2)	281.80	0.7128	0.2372	0.7254	0.1022
8.70 (L1)	281.85	0.4277	0.5223	0.5228	0.2702
9.20 (L1)	282.35	0.4751	0.4749	0.5619	0.2378
9.40 (L2)	282.55	0.6652	0.2848	0.6965	0.1262
9.45 (L1)	282.60	0.5246	0.4254	0.6002	0.2060
9.50 (L2)	282.65	0.6176	0.3324	0.6658	0.1516
9.55 ( (a))	282.70	0.5702	0.3798	0.6333	0.1786
5.60 (L1)	278.75	0.3156	0.5844	0.3500	0.2743
6.75 (L2)	279.90	0.7201	0.1799	0.6345	0.0671
7.50 (L1)	280.65	0.3601	0.5399	0.3883	0.2464
8.65 (L1)	281.80	0.4054	0.4946	0.4252	0.2195
8.70 (L2)	281.85	0.6749	0.2251	0.6086	0.0859
9.15 (L1)	282.30	0.4499	0.4501	0.4595	0.1946
9.40 (L2)	282.55	0.6303	0.2697	0.5819	0.1054
9.45 (L1)	282.60	0.4949	0.4051	0.4924	0.1706
9.50 (L2)	282.65	0.5850	0.3150	0.5534	0.1261
9.55 ( (a))	282.70	0.5398	0.3602	0.5236	0.3285
5.30 (L1)	278.45	0.2802	0.5198	0.2379	0.1868
6.80 (L2)	279.95	0.6399	0.1601	0.4620	0.0489
7.35 (L1)	280.50	0.3199	0.4801	0.2665	0.1692
8.50 (L1)	281.65	0.3600	0.4400	0.2942	0.1522
8.80 (L2)	281.95	0.6000	0.2000	0.4405	0.0621
9.05 (L2)	282.20	0.4002	0.3998	0.3210	0.1357
9.35 (L1)	282.50	0.4399	0.3601	0.3465	0.1200
9.45 (L2)	282.60	0.5598	0.2402	0.4181	0.0759
9.50 (L2)	282.65	0.5201	0.2799	0.3952	0.0900
9.55 ( (a))	282.70	0.4800	0.3200	0.3713	0.1047
6.80 (L1)	279.95	0.2399	0.3601	0.1373	0.0872
6.90 (L2)	280.05	0.4801	0.1199	0.2546	0.0269
8.10 (L1)	281.25	0.2700	0.3300	0.1530	0.0792
8.90 (L2)	282.05	0.2999	0.3001	0.1683	0.0713
8.90 (L2)	282.05	0.4499	0.1501	0.2408	0.0340
9.30 (L1)	282.45	0.3301	0.2699	0.1835	0.0635
9.40 (L2)	282.55	0.4200	0.1800	0.2269	0.0412
9.50 ( (a))	282.65	0.3899	0.2101	0.2126	0.0485
9.50 ( (a))	282.65	0.3600	0.2400	0.1982	0.0559
5.80 (L1)	278.95	0.1350	0.1650	0.0524	0.0271
7.20 (L2)	280.35	0.2400	0.0600	0.0910	0.0097
8.15 (L1)	281.25	0.1500	0.1500	0.0580	0.0246
9.00 (L2)	282.15	0.2250	0.0750	0.0856	0.0121
9.00 (L1)	282.15	0.1651	0.1349	0.0637	0.0220
9.40 (L2)	282.55	0.2101	0.0899	0.0802	0.0145
9.40 (L1)	282.55	0.1800	0.1200	0.0692	0.0195
9.55 ( (a))	282.70	0.1950	0.1050	0.0747	0.0170

Table 2. Solubility temperatures of two liquid phases
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)
10.65	283.80	0.2470	0.7405	0.4098	0.5200
15.35	288.50	0.8387	0.1488	0.8884	0.0667
16.50	289.65	0.2963	0.6913	0.4694	0.4635
20.50	293.65	0.3455	0.6420	0.5238	0.4120
20.98	294.13	0.7803	0.2072	0.8572	0.0963
22.98	296.13	0.3947	0.5928	0.5737	0.3647
23.72	296.87	0.7426	0.2449	0.8357	0.1166
24.31	297.46	0.4446	0.5429	0.6203	0.3206
25.17	298.32	0.6912	0.2963	0.8047	0.1460
25.24	298.39	0.4938	0.4938	0.6627	0.2805
25.65	298.80	0.5411	0.4464	0.7006	0.2446
25.68 (a)	298.83	0.5677	0.4198	0.7207	0.2256
25.73	298.88	0.6416	0.3459	0.7727	0.1763
25.80	298.95	0.5928	0.3947	0.7390	0.2082
4.70	277.85	0.8288	0.1463	0.8497	0.0635
6.45 (b)	279.60	0.2437	0.7313	0.3820	0.4852
7.60 (b)	280.75	0.1467	0.8283	0.2521	0.6024
8.70 (b)	281.85	0.0977	0.8773	0.1765	0.6706
9.10	282.25	0.2925	0.6825	0.4392	0.4337
10.40 (b)	283.55	0.0488	0.9262	0.0929	0.7460
10.80	283.95	0.7801	0.1949	0.8235	0.0871
13.10	286.25	0.3413	0.6337	0.4916	0.3864
14.55	287.70	0.7313	0.2437	0.7957	0.1122
15.32	288.47	0.3897	0.5853	0.5397	0.3430
16.56	289.71	0.6825	0.2925	0.7660	0.1389
16.71	289.86	0.4388	0.5362	0.5847	0.3024
17.36	290.51	0.4875	0.4875	0.6262	0.2650
17.48	290.63	0.6338	0.3413	0.7345	0.1674
17.51	290.66	0.5363	0.4387	0.6648	0.2302
17.64	290.79	0.5851	0.3899	0.7009	0.1977
17.67 (a)	290.82	0.5635	0.4115	0.6852	0.2118
7.90	281.05	0.3370	0.6255	0.4624	0.3633
10.0	283.15	0.3855	0.5770	0.5094	0.3227
10.03	283.18	0.6737	0.2888	0.7299	0.1325
10.92	284.07	0.6267	0.3358	0.6996	0.1586
11.22	284.37	0.4336	0.5289	0.5527	0.2854
11.49	284.64	0.5775	0.3850	0.6657	0.1878
11.62 (a)	284.77	0.5541	0.4084	0.6489	0.2024
11.78	284.93	0.5293	0.4332	0.6304	0.2183
11.79	284.94	0.4811	0.4814	0.5926	0.2510
10.03	283.18	0.6738	0.2888	0.7302	0.1325
10.29	283.44	0.6745	0.2891	0.7330	0.1330
11.32	284.47	0.6762	0.2898	0.7398	0.1342
13.95	287.10	0.6797	0.2913	0.7542	0.1368
16.57	289.72	0.6825	0.2925	0.7660	0.1389
18.23	291.38	0.6843	0.2933	0.7735	0.1403
19.49	292.64	0.6857	0.2939	0.7796	0.1414
23.31	296.46	0.6894	0.2954	0.7961	0.1444
25.18	298.33	0.6911	0.2962	0.8042	0.1457
27.51	300.66	0.6934	0.2972	0.8145	0.1477
30.76	303.91	0.6964	0.2985	0.8290	0.1504
10.45	283.60	0.5519	0.4080	0.6414	0.2007
10.70	283.85	0.5521	0.4081	0.6423	0.2009
11.62	284.77	0.5534	0.4091	0.6483	0.2029
12.61	285.76	0.5550	0.4103	0.6559	0.2052
14.90	288.05	0.5579	0.4123	0.6695	0.2094
17.67	290.82	0.5607	0.4144	0.6843	0.2140
17.71	290.86	0.5608	0.4145	0.6840	0.2140
20.91	294.06	0.5637	0.4166	0.6987	0.2186
24.38	297.53	0.5667	0.4189	0.7148	0.2237
25.69	298.84	0.5678	0.4196	0.7205	0.2254
27.41	300.56	0.5691	0.4207	0.7280	0.2278
31.22	304.37	0.5722	0.4229	0.7453	0.2331
9.42	282.57	0.4305	0.5261	0.5380	0.2783
9.80	282.95	0.4311	0.5269	0.5413	0.2800
10.68	283.83	0.4324	0.5284	0.5482	0.2835
10.70	283.85	0.4325	0.5286	0.5489	0.2839
11.22	284.37	0.4331	0.5294	0.5523	0.2857
11.31	284.46	0.4334	0.5297	0.5538	0.2865
12.47	285.62	0.4347	0.5313	0.5611	0.2903
14.36	287.51	0.4367	0.5337	0.5725	0.2961
16.52	289.67	0.4386	0.5361	0.5839	0.3020
16.71	289.86	0.4388	0.5363	0.5850	0.3026
19.72	292.87	0.4411	0.5392	0.5993	0.3100
22.38	295.53	0.4431	0.5415	0.6116	0.3164
24.31	287.46	0.4443	0.5430	0.6195	0.3205
25.66	298.81	0.4454	0.5444	0.6270	0.3244
29.60	302.75	0.4477	0.5471	0.6424	0.3323

Table 3. Composition of three coexisting liquid phases system nitromethane + octanoic acid + water*
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)	Comment(s)
9	282	0.662	0.259	0.637	0.106	nitromethane-rich phase
9	282	0.446	0.482	0.499	0.228	acid-rich phase
9	282	0.032	0.001	0.0097	0.0001	water-rich phase

Notes:
   Table 1  ^a    Critical opalescence.
   Table 2  ^a   Critical opalescence.
   Table 2  ^b   Solubility temperature of solid phase.
   Table 3  ^*   These data were extracted graphically by the compilers.

Method/Apparatus/Procedure:
   The synthetic method (Alekseev¹) was used. Ampoules with given amount of (1), (2) and (3) were heated with vigorous stirring to a temperature somewhat higher than the phase transition temperature and then were slowly cooled till turbidity appeared. Then the turbidity disappearance temperature was determined when heated at a slow rate.

Source and Purity of Materials:
   (1) Source not specified; pure grade reagent; dried and repeatedly distilled in a packed glass column; n(20 °C, D) = 1.3819, d(20 °C, 4 °C) = 1.1380.
   (2) Source not specified; pure grade reagent; dried and repeatedly distilled at vacuum; n(20 °C, D) = 1.4279, d(20 °C, 4 °C) = 0.9090.
   (3) Twice distilled.

Estimated Errors:

   Temperature: ± 0.01 K.

References:
   ¹V. F. Alekseev, Zh. Russ. Fiz.-Khim. Ova 8, 249 (1876).