IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Lithium formate with Potassium formate and Water

Components:
   (1) Potassium formate; KCHO2; [590-29-4]  NIST Chemistry WebBook for detail
   (2) Lithium formate; LiCHO2; [556-63-8]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Itkina, L.S.; Chaplygina, N.M.; Petrova, E.V., Zh. Neorg. Khim. 24, 788-94 (1979); Russ. J. Inorg. Chem. (Engl. Transl.) 24, 440-3 (1979).

Variables:

   Concentration = Composition at 25ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

Experimental Remarks:

   The molality values were calculated by the compilers.

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

Solubility values in the LiCHO₂-KCHO₂-H₂O system at 25 °C.
Chemical₁	Phase	Mass Fraction w₁	m₁ [mol kg-1]	Chemical₂	Mass Fraction w₂	m₂ [mol kg-1]	Solid Phase(s)^a
LiCHO2	Liquid phase	27.85	7.429	KCHO2	---	---	A
LiCHO2	Liquid phase	26.30	7.187	KCHO2	3.27	0.552	A
LiCHO2	Liquid phase	25.53	7.688	KCHO2	10.56	1.964	A
LiCHO2	Liquid phase	22.54	7.775	KCHO2	26.66	4.615	A
LiCHO2	Liquid phase	21.41	8.375	KCHO2	29.39	7.101	A
LiCHO2	Liquid phase	22.01	10.02	KCHO2	35.71	10.04	A
LiCHO2	Liquid phase	24.71	12.12	KCHO2	36.06	10.93	A
LiCHO2	Liquid phase	25.61	13.65	KCHO2	38.29	12.61	A
LiCHO2	Liquid phase	23.88	12.76	KCHO2	40.10	13.23	A
LiCHO2	Liquid phase	24.33	14.14	KCHO2	42.55	15.27	A
LiCHO2	Liquid phase	27.03	21.03	KCHO2	48.23	23.18	A
LiCHO2	Liquid phase	24.63	18.27	KCHO2	49.42	22.64	A
LiCHO2	Liquid phase	24.78	18.78	KCHO2	49.82	23.32	A
LiCHO2	Liquid phase	24.93	15.58	KCHO2	44.28	17.10	A+B
LiCHO2	Liquid phase	23.66	15.52	KCHO2	46.99	19.03	B
LiCHO2	Liquid phase	17.44	10.47	KCHO2	50.49	18.72	B
LiCHO2	Liquid phase	15.57	9.861	KCHO2	54.04	21.14	B
LiCHO2	Liquid phase	15.35	9.421	KCHO2	53.29	20.20	B
LiCHO2	Liquid phase	11.83	7.981	KCHO2	59.64	24.85	B
LiCHO2	Liquid phase	10.48	7.538	KCHO2	62.76	27.88	B
LiCHO2	Liquid phase	9.88	6.57	KCHO2	61.18	25.13	B+C
LiCHO2	Liquid phase	8.54	8.72	KCHO2	72.61	45.79	C
LiCHO2	Liquid phase	1.57	2.07	KCHO2	83.80	68.09	C
LiCHO2	Liquid phase	-	-	KCHO2	81.82	53.50	C

Notes:
   ^a  The solid phase are: A = LiCHO₂•H₂O ; B = LiCHO₂•KCHO₂•0.5H₂O; C = KCHO₂.

Method/Apparatus/Procedure:
   The isothermal method was used. Three weeks, with stirring, were allowed for equilibration. The lithium content of both phases was determined by flame photometry. The potassium content was determined by flame photometry and by the tetraphenyl-borate method. The composition of the solid phases was determined by Schreinemakers' method.

Source and Purity of Materials:
   The lithium and potassium formates were prepared by neutralizing 85% formic acid with the corresponding pro analysis grade hydroxides. After evaporation, the salts were washed with ethanol and dried over H₂SO₄. The products were LiCHO₂•H₂O and KCHO₂. Anhydrous LiCHO₂ was obtained by drying the hydrate at 100-110 °C in a N₂ atmosphere.

Estimated Errors:
   Solubility: No information is given.
   Temperature: No information is given.