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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium formate with Formic acid
Components:
(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).
Variables:
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 NH
4
CHO
2
-CH
2
O
2
system.
a
t/°C
Mass Fraction w
1
10
0
* Mole Fraction
1
b
Solid Phase(s)
c
-3
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
57.8
50.0
C
78
73.1
66.5
C
116
100
100
m.p.
Notes:
a
The starting solute was NH
4
CHO
2
•CH
2
O
2
. The solubility values are expressed in terms of NH
4
CHO
2
.
b
These values were calculated by the compiler.
c
The solid phases are: A = NH
4
CHO
2
•CH
2
O
2
; B = NH
4
CHO
2
(labile); C = NH
4
CHO
2
(stable).
Method/Apparatus/Procedure:
The freezing point method was used to study the system. No other information is given.
Source and Purity of Materials:
NH
4
CHO
2
•CH
2
O
2
was prepared by the reaction of equimolar quantities of NH
4
CHO
2
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.