IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Sodium formate with Ethanol and Water

Components:
   (1) Ethanol; C2H6O; [64-17-5]  NIST Chemistry WebBook for detail
   (2) Sodium formate; NaCHO2; [141-53-7]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Heubel, J.; Vandorpe, B.; Devallez, B., Bull. Soc. Chim. Fr. 531 (1963).

Variables:

   Concentration = Composition and temperature

Prepared By:
   T. A. Ageyeva

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)

Table 1. Solubility values in the NaCHO₂-C₂H₆O-H₂O system.
T/K	Chemical₁	Mass Fraction w₁	10⁰ * Mole Fraction₁^a	Chemical₂	Mass Fraction w₂	Mole Fraction₂^a	Chemical₃	Mass Fraction w₃	Mole Fraction₃^a	Solid Phase(s)^b
293.2 K	NaCHO2	44.8	17.7	C2H6O	0.0	0.0	H2O a	55.2	82.3	A
293.2 K	NaCHO2	42.5	17.0	C2H6O	4.1	2.4	H2O a	53.4	80.6	A
293.2 K	NaCHO2	41.8	16.7	C2H6O	4.8	2.8	H2O a	53.4	80.5	A
293.2 K	NaCHO2	40.0	16.2	C2H6O	8.2	4.9	H2O a	51.8	79.0	A
293.2 K	NaCHO2	39.8	16.0	C2H6O	8.0	4.8	H2O a	52.2	79.2	A
293.2 K	NaCHO2	39.3	15.8	C2H6O	8.5	5.0	H2O a	52.2	79.2	A
293.2 K	NaCHO2	38.4	15.6	C2H6O	10.6	6.35	H2O a	51.0	78.1	A
293.2 K	NaCHO2	38.0	15.5	C2H6O	11.3	6.78	H2O a	50.7	77.8	A
293.2 K	NaCHO2	37.5	15.3	C2H6O	12.2	7.34	H2O a	50.3	77.4	A
293.2 K	NaCHO2	37.0	15.0	C2H6O	12.4	7.43	H2O a	50.6	77.5	A
293.2 K	NaCHO2	36.8	15.1	C2H6O	13.8	8.36	H2O a	49.4	76.5	A
293.2 K	NaCHO2	36.1	14.8	C2H6O	14.7	8.91	H2O a	49.2	76.3	A
293.2 K	NaCHO2	34.2	14.1	C2H6O	17.1	10.4	H2O a	48.7	75.6	A
293.2 K	NaCHO2	33.5	13.9	C2H6O	19.0	11.7	H2O a	47.5	74.4	A + B
293.2 K	NaCHO2	32.7	13.6	C2H6O	20.2	12.4	H2O a	47.3	74.1	B
293.2 K	NaCHO2	16.4	7.57	C2H6O	51.8	35.3	H2O a	32.8	57.1	B
293.2 K	NaCHO2	15.5	7.40	C2H6O	54.4	38.4	H2O a	30.1	54.3	B
293.2 K	NaCHO2	12.7	6.24	C2H6O	60.3	43.7	H2O a	27.0	50.0	B
293.2 K	NaCHO2	11.3	5.72	C2H6O	64.6	48.3	H2O a	24.1	46.0	B
293.2 K	NaCHO2	9.9	5.1	C2H6O	68.3	52.2	H2O a	21.8	42.6	B
293.2 K	NaCHO2	8.6	4.5	C2H6O	71.5	55.8	H2O a	19.9	39.7	B + C
293.2 K	NaCHO2	7.1	3.8	C2H6O	73.7	57.8	H2O a	19.2	38.5	C
293.2 K	NaCHO2	6.0	3.2	C2H6O	76.0	60.3	H2O a	18.0	36.5	C
293.2 K	NaCHO2	3.4	1.9	C2H6O	81.8	67.1	H2O a	14.8	31.0	C
293.2 K	NaCHO2	3.3	1.9	C2H6O	83.7	70.2	H2O a	13.0	27.9	C
293.2 K	NaCHO2	2.9	1.7	C2H6O	84.1	70.5	H2O a	13.0	27.9	C
293.2 K	NaCHO2	2.7	1.6	C2H6O	86.7	75.0	H2O a	10.6	23.4	C
293.2 K	NaCHO2	2.3	1.4	C2H6O	87.6	76.2	H2O a	10.1	22.5	C
293.2 K	NaCHO2	1.4	0.83	C2H6O	89.4	78.5	H2O a	9.2	21.	C
293.2 K	NaCHO2	1.2	0.73	C2H6O	91.1	81.6	H2O a	7.7	18.	C
293.2 K	NaCHO2	0.9	0.6	C2H6O	93.2	85.6	H2O a	5.9	14.	C
293.2 K	NaCHO2	0.7	0.5	C2H6O	95.1	89.5	H2O a	4.2	10.	C
293.2 K	NaCHO2	0.6	0.4	C2H6O	96.6	92.7	H2O a	2.8	6.9	C
293.2 K	NaCHO2	0.2	0.1	C2H6O	99.8	99.9	H2O a	0.0	0.0	C
298.2	NaCHO2	48.3	19.8	C2H6O	0.0	0.0	H2O a	51.7	80.2	A
298.2	NaCHO2	47.3	19.5	C2H6O	1.4	0.85	H2O a	51.3	79.7	A
298.2	NaCHO2	46.4	19.2	C2H6O	3.2	2.0	H2O a	50.4	78.8	A
298.2	NaCHO2	45.3	18.8	C2H6O	4.6	2.8	H2O a	50.1	78.4	A
298.2	NaCHO2	43.9	18.3	C2H6O	6.9	4.3	H2O a	49.2	77.4	A
298.2	NaCHO2	42.9	18.0	C2H6O	8.8	5.5	H2O a	48.3	76.5	A
298.2	NaCHO2	42.7	18.0	C2H6O	9.2	5.7	H2O a	48.1	76.3	A + B
298.2	NaCHO2	42.5	17.8	C2H6O	9.2	5.7	H2O a	48.3	76.5	B
298.2	NaCHO2	8.4	4.3	C2H6O	69.0	52.1	H2O a	22.6	43.6	B
298.2	NaCHO2	8.0	4.1	C2H6O	69.3	52.2	H2O a	22.7	43.7	B + C
298.2	NaCHO2	6.7	3.5	C2H6O	72.2	55.3	H2O a	21.1	41.3	C
298.2	NaCHO2	6.0	3.2	C2H6O	74.2	57.6	H2O a	19.8	39.3	C
298.2	NaCHO2	5.3	2.9	C2H6O	77.1	61.3	H2O a	17.6	35.8	C
298.2	NaCHO2	3.5	1.9	C2H6O	79.6	63.3	H2O a	16.9	34.8	C
298.2	NaCHO2	2.9	1.6	C2H6O	82.2	68.0	H2O a	14.4	30.4	C
298.2	NaCHO2	2.1	1.2	C2H6O	85.3	71.7	H2O a	12.6	27.1	C
298.2	NaCHO2	1.3	0.76	C2H6O	88.6	76.8	H2O a	10.1	22.4	C
298.2	NaCHO2	0.8	0.5	C2H6O	93.0	85.0	H2O a	6.2	14.0	C
298.2	NaCHO2	0.5	0.3	C2H6O	95.1	89.1	H2O a	4.4	11.0	C
298.2	NaCHO2	0.2	0.1	C2H6O	99.8	99.9	H2O a	0.0	0.0	C

Table 2. Exfoliation dependence in the NaCHO₂-C₂H₆O-H₂O system.^a
t/°C	Chemical₁	Mass Fraction w₁	10⁰ * Mole Fraction₁	Chemical₂	Mass Fraction w₂	Mole Fraction₂	Solid Phase(s)^b	Comment(s)
19.5	NaCHO2	12.9	7.36	C2H6O	31.5	26.6	A	ethanol-rich phase
20.0	NaCHO2	11.0	6.28	C2H6O	34.7	29.3	A	ethanol-rich phase
22.5	NaCHO2	7.23	4.27	C2H6O	41.7	36.4	A	ethanol-rich phase
25.0	NaCHO2	5.57	3.38	C2H6O	45.7	41.0	A	ethanol-rich phase
27.5	NaCHO2	5.48	3.42	C2H6O	47.2	43.5	B	ethanol-rich phase
30.0	NaCHO2	5.53	3.46	C2H6O	47.6	43.0	B	ethanol-rich phase
32.5	NaCHO2	5.45	3.43	C2H6O	48.1	44.7	B	ethanol-rich phase
35.0	NaCHO2	5.43	3.39	C2H6O	47.5	43.6	B	ethanol-rich phase
37.5	NaCHO2	5.42	3.42	C2H6O	47.8	44.6	B	ethanol-rich phase
40.0	NaCHO2	5.35	3.40	C2H6O	48.1	45.1	B	ethanol-rich phase
19.5	NaCHO2	19.9	11.4	C2H6O	16.9	14.2	A	water-rich phase
20.0	NaCHO2	21.9	12.5	C2H6O	13.5	11.4	A	water-rich phase
22.5	NaCHO2	25.8	15.3	C2H6O	9.04	7.89	A	water-rich phase
25.0	NaCHO2	28.2	17.1	C2H6O	6.10	5.46	A	water-rich phase
27.5	NaCHO2	28.6	17.9	C2H6O	6.40	5.91	B	water-rich phase
30.0	NaCHO2	28.7	18.0	C2H6O	5.92	5.48	B	water-rich phase
32.5	NaCHO2	28.9	18.2	C2H6O	5.51	5.12	B	water-rich phase
35.0	NaCHO2	29.1	18.1	C2H6O	4.97	4.56	B	water-rich phase
37.5	NaCHO2	29.3	18.5	C2H6O	5.48	5.11	B	water-rich phase
40.0	NaCHO2	29.5	18.7	C2H6O	5.61	5.26	B	water-rich phase

Notes:
   Table 1  ^a  These values were calculated by the compiler.
   Table 1  ^b  The solid phases are: A = NaCHO₂•2H₂O; B = NaCHO₂•1.75H₂O; C = NaCHO₂.
   Table 2  ^a  All the concentration values were calculated by the compiler.
   Table 2  ^b  The solid phases are: A = NaCHO₂•1.75 H₂O; B = NaCHO₂.

Method/Apparatus/Procedure:
   The isothermal method was used. Equilibrium was achieved within several hours. The NaCHO₂ content was determined gravimetrically as chloride. Ethanol was determined by the chromic nitrate oxidation method of Cordebart¹ with the difference that the NaCHO₂ was first separated from the solvent by distillation in vacuo. The solid phases were identified by the Schreinmakers method.

Source and Purity of Materials:
   a.r. grade NaCHO₂ was dehydrated at 273.2 K, m.p. 528.2 ± 1 K. Ethanol was dehydrated over calcium followed by distillation. The source and purity of water are not stated.

Estimated Errors:

   Temperature: ± 0.1 K. Nothing else is stated.

References:
   ¹M. H. Cordebart, J. Pharm. Chem. 30, 263 (1939).