Solubility System: Ammonium formate with Formic acid
Components:

(1) Ammonium formate, NH4CHO2; [540-69-2] NIST WebBook
(2) Formic acid, CH2O2; [64-18-6] NIST WebBook

Original Measurements

Groschuff, E.; Ber. Dtsch. Chem. Ges. 36, 1783-95 (1903).

Variables:

Ambient temperature: 270.2 - 398.2 K

Prepared by:

T.A. Ageyeva

Method/Apparatus/Procedure:

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

Source and Purity of Materials:
  1. 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:

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

Experimental Values:
Solubility values in the NH4CHO2-CH2O2 system.a
T (°C) 100w1 100x1b Phase (s)c
-3.0 35.3 28.5 A
8.5 40.6 33.3 A
21.5 50.0 42.2 A
11.0 50.0 42.2 B
39.0 57.8 50.0 C
78.0 73.1 66.5 C
116.0 100.0 100.0 m.p.

(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). (d) Melting point

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