IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Potassium formate with Formic acid

Components:
   (1) Potassium formate; KCHO2; [590-29-4]  NIST Chemistry WebBook for detail
   (2) Formic acid; CH2O2; [64-18-6]  NIST Chemistry WebBook for detail

Original Measurements:
   Groschuff, E., Ber Dtsch. Chem. Ges. 36, 1783, 4351 (1903).

Variables:
   Temperature = 0 ºC to 90 ºC

Prepared By:
   T. A. Ageyeva

Experimental Remarks:

   Note: The starting salt was KCHO₂·CH₂O₂.

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

Solubility of potassium formate in formic acid.
t/°C	Mass Fraction w₁	10⁰ * Mole Fraction₁^a	Solid Phase(s)
0	36.3	23.8	KCHO2•CH2O2
19.5	38.2	25.3	KCHO2•CH2O2
39.5	40.8	27.4	KCHO2•CH2O2
60	44.0	30.1	KCHO2•CH2O2
70	45.9	31.7	KCHO2•CH2O2
90	52.1	37.3	KCHO2•CH2O2

Notes:
   ^a  These values were calculated by the compiler.

Method/Apparatus/Procedure:
   The freezing point method was used to study the system. No other information is given.

Source and Purity of Materials:
   KCHO₂•CH₂O₂ was prepared by dissolving dry potassium formate in anhydrous formic acid with heating. On cooling to room temperature hexahedral plates separated out.

Estimated Errors:

   Temperature: Nothing is specified. The compiler estimates that the temperature was controlled to within ± 0.5 °C.