IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Lithium formate with Formic acid and Water

Components:
   (1) Formic acid; CH2O2; [64-18-6]  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:
   Sas, T.M.; Rodina,G.L.; Velikodnyn, Yu. A., Tr. IREA Moscow Ser. Reagents and specially pure substances 42, 168 (1980).

Variables:

   Concentration = Composition at 298.2 K

Prepared By:
   T. A. Ageyeva

Experimental Remarks:

   Note: Data are also presented for 323.2 K, but only in graphical form.

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

Solubility in the LiCHO₂-CH₂O₂-H₂O system at 298.2 K.
Chemical₁	Mass Fraction w₁^a	10⁰ * Mole Fraction₁^a	Chemical₂	Mass Fraction w₂	Mole Fraction₂^a	Chemical₃	Mass Fraction w₃	Mole Fraction₃^a	Solid Phase(s)^b
LiCHO2	27.0	24.1	CH2O2	71.5	72.0	H2O	1.5	3.9	A
LiCHO2	24.9	20.8	CH2O2	69.5	65.7	H2O	5.6	13	A
LiCHO2	19.3	12.9	CH2O2	58.5	44.2	H2O	22.2	42.9	A
LiCHO2	23.2	12.6	CH2O2	34.4	21.1	H2O	42.4	66.3	A
LiCHO2	32.9	17.4	CH2O2	21.2	12.7	H2O	45.9	70.0	A

Notes:
   ^a  These values were calculated by the compiler.
   ^b  The solid phase is: A = LiCHO₂•CH₂O₂.

Method/Apparatus/Procedure:
   The isothermal method was used.¹ The formic acid was determined by titration with 0.1 N NaOH using phenolphthalein as indicator. The LiCHO₂ concentration was determined by titration with NaOH after passing the weighed sample through a chromatographic column. The water content was calculated by difference. The solid phase was identified by chemical, thermogravimetric, gas chromatographic and x-ray methods.

Source and Purity of Materials:
   No information is given.

Estimated Errors:
   Solubility: ± 0.5 mass %. Nothing else is specified.

References:
   ¹D. F. Othmer and P. E. Tobias, Ind. Eng. Chem. 34, 690 (1971).