IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Sodium formate with Acetone and Water

Components:
   (1) Acetone; C3H6O; [67-64-1]  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:
   Bianco, P.; Haladjian, J.; Lanza, E, M. Asso, Bull. Soc. Chim. Fr. 1253 (1971).

Variables:

   Concentration = Composition at 25 ºC

Prepared By:
   T. A. Ageyeva

Experimental Remarks:

   Two immiscible solutions were observed: L₁, water saturated with acetone, and, L₂, acetone saturated with water.

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

Table 1. Solubility values in the NaCHO₂-C₃H₆O-H₂O system.
Chemical₁	Mass Fraction w₁	10⁰ * Mole Fraction₁^a	Chemical₂	Mass Fraction w₂	Mole Fraction₂^a	Chemical₃	Mass Fraction w₃	Mole Fraction₃^a	Comment(s)
NaCHO2	0.00014	0.00012	C3H6O	100	100	H2O	0.0	0.0	Layer L1, Mixture number 1
NaCHO2	0.20	0.15	C3H6O	94.0	83.3	H2O	5.80	16.6	Layer L1, Mixture number 2
NaCHO2	0.30	0.19	C3H6O	82.0	58.9	H2O	17.7	41.0	Layer L1, Mixture number 3
NaCHO2	0.32	0.19	C3H6O	78.8	53.8	H2O	20.9	46.0	Layer L1, Mixture number 4
NaCHO2	0.35	0.20	C3H6O	75.8	49.5	H2O	23.9	50.3	Layer L1, Mixture number 5
NaCHO2	0.52	0.28	C3H6O	74.0	47.3	H2O	25.5	52.5	Layer L1, Mixture number 6
NaCHO2	0.81	0.43	C3H6O	71.5	44.3	H2O	27.7	55.3	Layer L1, Mixture number 7
NaCHO2	2.07	0.99	C3H6O	62.7	35.2	H2O	35.2	63.8	Layer L1, Mixture number 8

Table 2. Solubility values in the NaCHO₂-C₃H₆O-H₂O system.
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	Comment(s)
NaCHO2	48.8	20.2	C3H6O	0.0	0.0	H2O	51.2	79.8	A + B	Layer L2, Mixture number 1
NaCHO2	48.9	20.2	C3H6O	2.98	1.49	H2O	48.1	77.6	A + B	Layer L2, Mixture number 2
NaCHO2	35.5	13.4	C3H6O	5.50	2.43	H2O	59.1	81.2	L1 + L2 + B	Layer L2, Mixture number 3
NaCHO2	27.2	9.93	C3H6O	10.8	4.62	H2O	62.0	85.5	L1 + L2	Layer L2, Mixture number 4
NaCHO2	24.0	8.68	C3H6O	13.2	5.59	H2O	62.8	85.7	L1 + L2	Layer L2, Mixture number 5
NaCHO2	19.6	7.01	C3H6O	16.7	7.00	H2O	63.7	87.0	L1 + L2	Layer L2, Mixture number 6
NaCHO2	17.4	6.25	C3H6O	19.5	8.17	H2O	63.1	85.9	L1 + L2	Layer L2, Mixture number 7
NaCHO2	11.5	4.27	C3H6O	29.5	12.8	H2O	59.1	82.9	L1 + L2	Layer L2, Mixture number 8
NaCHO2	10.0	3.83	C3H6O	34.0	15.2	H2O	56.0	80.9	A	Layer L2, Mixture number 9

Notes:
   ^a  These values were calculated by the compilers.
   ^b  The phases are: A = liquid; B = NaCHO₂.

Method/Apparatus/Procedure:
   The isothermal method was used. Equilibrium was reached within 24 hours. The sodium formate content was determined by potentiometric titration. Acetone and water were determined spectrophotometrically using λ = 275 nm and λ = 1920 nm, respectively. The solid phase was identified with thermogravimetry.

Source and Purity of Materials:
   Commercial NaCHO₂ was dehydrated and dried at 413.2 K for 48 h. Commercial acetone was purified by drying with anhydrous CaSO₄.¹. It contained 0.03 % ± 0.01 % water. Freshly distilled water was used.

Estimated Errors:

   Temperature: The temperature was controlled to within ± 0.05 K.

References:
   ¹A. Weissberger and E. S. Proskauer, Techniques of Organic Chemistry, VII Organic Solvents, Interscience, New York, p. 293 (1955).