IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Ammonium formate with Formic acid

   (1) Ammonium formate; NH4CHO2; [540-69-2]  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).

   Temperature = 270.2 K to 398.2 K

Prepared By:
   T. A. Ageyeva

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the NH4CHO2-CH2O2 system.a
t/°CMass Fraction w1100 * Mole Fraction1bSolid Phase(s)c
    -3  35.3  28.5A
    8.5  40.6  33.3A
  21.5  50.0  42.2A
  11.0  50.0  42.2B
  39  57.8  50.0C
  78  73.1  66.5C
   a  The starting solute was NH4CHO2•CH2O2. The solubility values are expressed in terms of NH4CHO2.
   b  These values were calculated by the compiler.
   c  The solid phases are: A = NH4CHO2•CH2O2; B = NH4CHO2 (labile); C = NH4CHO2 (stable).

   The freezing point method was used to study the system. No other information is given.

Source and Purity of Materials:
   NH4CHO2•CH2O2 was prepared by the reaction of equimolar quantities of NH4CHO2 and anhydrous formic acid. On cooling with ice to 283 K, small hexahedral plates separated out. No other information is given.

Estimated Errors:

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