IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: Ammonium formate with Water

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Components:
   (1) Ammonium formate; NH4CHO2; [540-69-2]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

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

Variables:
   Temperature = -1 ºC to -116 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

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

Composition of equilibrium liquid phase.

t/°C	Phase	Mass Fraction w1	m1 [mol kg-1]a	Solid Phase(s)
-1	Liquid	50.0	15.9	NH4CHO2
+12.5	Liquid	55.6	19.9	NH4CHO2
20.0	Liquid	58.9	22.7	NH4CHO2
29.0	Liquid	62.5	26.4	NH4CHO2
39.0	Liquid	66.7	31.8	NH4CHO2
63.5	Liquid	76.9	52.8	NH4CHO2
116.0	Liquid	100.0	---	Melting point (b)

Notes:
   ^a  These values were calculated by the compilers.
   ^b  Melting point.

Method/Apparatus/Procedure:
   The precise quantities of solute and solvent are weighed and mixed. After the solute has completely dissolved the mixture is cooled until a small quantity of precipitate is formed. The temperature at which the solid disappears is measured.

Source and Purity of Materials:
   No information is given.

Estimated Errors:
   Solubility: There is some error due to loss of ammonia vapor, but this was not evaluated quantitatively.

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Last updated: February 18, 2015 (Created: August 17, 2007)