IUPAC-NIST Solubility Database
NIST Standard Reference Database 106


Glass Ball as Bullet Solubility System: Sodium formate with Formic Acid and Water

Components:
   (1) Formic acid; CH2O2; [64-18-6]  NIST Chemistry WebBook for detail
   (2) Sodium formate; NaCHO2; [141-53-7]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Bianco, P.; Haladjian, J.; Sabbah, R., Bull. Soc. Chim. Fr. 7, 2301 (1969).

Variables:

   Concentration = Composition at 25 ºC

Prepared By:
   T. A. Ageyeva

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)
  
Solubility values in the NaCHO2-CH2O2-H2O system at 25ºC.
Chemical1Mass Fraction w1100 * Mole Fraction1aChemical2Mass Fraction w2Mole Fraction2aChemical3Mass Fraction w3Mole Fraction3aSolid Phase(s)b
NaCHO232.6423.45CH2O264.3168.28H2O  3.058.27A
NaCHO233.5922.23CH2O257.9656.68H2O  8.4521.1A
NaCHO234.7921.88CH2O253.0649.29H2O12.1528.83A
NaCHO235.9121.37CH2O247.8042.04H2O16.2936.59A
NaCHO237.8122.11CH2O244.2038.19H2O17.9939.70A
NaCHO238.1022.03CH2O243.0036.73H2O18.9041.24A + B
NaCHO238.2222.07CH2O242.7836.51H2O19.0041.42B
NaCHO238.6921.58CH2O239.5232.56H2O21.7945.86B
NaCHO239.7820.95CH2O233.6326.18H2O26.5952.87B
NaCHO240.2419.91CH2O227.7220.26H2O32.0459.83B
NaCHO241.8219.89CH2O222.2915.67H2O35.8964.44B
NaCHO246.6820.74CH2O2  9.93  6.52H2O43.3972.74B
NaCHO247.6021.05CH2O2  8.37  5.47H2O44.0373.48B
NaCHO248.0020.91CH2O2  6.40  4.12H2O45.6074.97B + C
NaCHO248.2120.95CH2O2  5.89  3.78H2O45.9075.27C
NaCHO248.6220.60CH2O2  2.84  1.78H2O48.5477.62C
Notes:
   a  These values were calculated by the compiler.
   b  The solid phases are: A = NaCHO2•CH2O2; B = 3NaCHO2•CH2O2; C = NaCHO2.

Method/Apparatus/Procedure:
   The isothermal method was used. The sodium formate content was determined by potentiometric titration. The solid phase was identified by thermogravimetry and Schreinemakers method.

Source and Purity of Materials:
   Analytical NaCHO2 was used as received. Commercial a.r. grade formic acid contained less than 2 % water. Deionized water was used.

Estimated Errors:

   Temperature: The temperature was controlled to within ± 0.05 °C. For the solubility it was ± 1%.