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:
   Portnova, S.M., Petrova, E.V., Zh. Neorg. Khim. 30, 1838-43 (1985); Russ. J. Inorg. Chem. (Engl. Transl.) 30, 1045-8 (1985).

Variables:

   Concentration = Composition at 50 ºC

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 50 °C.
Chemical₁	Phase	Mass Fraction w₁	m₁ [mol kg-1]	Chemical₂	Mass Fraction w₂	m₂ [mol kg-1]	Solid Phase(s)^a
LiCHO2	Liquid	36.04	10.84	KCHO2	---	---	A
LiCHO2	Liquid	34.44	14.59	KCHO2	20.12	5.26	A
LiCHO2	Liquid	32.49	19.40	KCHO2	35.28	13.01	A
LiCHO2	Liquid	34.37	22.45	KCHO2	36.17	14.60	A
LiCHO2	Liquid	34.81	30.34	KCHO2	43.11	23.21	A
LiCHO2	Liquid	36.46	37.05	KCHO2	44.60	27.99	A
LiCHO2	Liquid	36.16	39.63	KCHO2	46.28	31.33	A+B
LiCHO2	Liquid	33.99	33.48	KCHO2	46.47	28.27	B
LiCHO2	Liquid	28.15	32.10	KCHO2	54.97	38.71	B
LiCHO2	Liquid	19.92	24.58	KCHO2	64.48	49.14	B
LiCHO2	Liquid	12.20	12.43	KCHO2	68.91	43.37	B
LiCHO2	Liquid	7.64	7.09	KCHO2	71.62	41.05	B+C
LiCHO2	Liquid	6.32	4.22	KCHO2	76.83	54.21	C
LiCHO2	Liquid	4.76	6.49	KCHO2	81.13	68.35	C
LiCHO2	Liquid	---	---	KCHO2	84.69	65.76	C

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

Method/Apparatus/Procedure:
   The isothermal method was used. Two weeks were allowed for equilibration. The potassium and lithium content of both phases was determined by flame photometry using a Carl Zeiss photometer.¹ The potassium content of the solid phase was also determined by the tetraphenylborate method in an acetic acid medium.²

Source and Purity of Materials:

Estimated Errors:
   Solubility: The analytical error is ± 5%.

References:
   ¹N. S. Poluektov, Methods of Analysis by Flame Photometry (Russ), 2nd ed. (Khimiya, Moscow, 1967), p.308.
   ²G. G. Russakova, Zh. Anal. Khim. 18, 154 (1963).