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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium formate with Formic acid and Water
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
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Groschuff, E., Ber. 36, 4351 (1903).
Variables:
Concentration = Composition at 266.7 K to 312.2 K
Prepared By:
T. A. Ageyeva
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Table 1. Solubility in the NH
4
CHO
2
-CH
2
O
2
-H
2
O system.
t/°C
Chemical
1
Mass Fraction w
1
10
0
* Mole Fraction
1
a
Chemical
2
Mass Fraction w
2
Mole Fraction
2
a
Chemical
3
Mass Fraction w
3
Mole Fraction
3
a
Solid Phase(s)
b
-6.5
NH4CHO2
46.7
29.1
CH2O2
34.1
29.1
H2O
19.2
41.8
A
1.5
NH4CHO2
49.6
33.3
CH2O2
36.2
33.3
H2O
14.2
33.4
A
4
NH4CHO2
50.4
34.6
CH2O2
36.8
34.6
H2O
12.8
30.8
A
6
NH4CHO2
51.3
36.1
CH2O2
37.4
36.1
H2O
11.3
27.8
A
8.5
NH4CHO2
52.1
37.5
CH2O2
38.0
37.5
H2O
9.9
25
A
-7
NH4CHO2
49.6
33.3
CH2O2
36.2
33.3
H2O
14.2
33.4
B
13
NH4CHO2
53.0
39.2
CH2O2
38.6
39.1
H2O
8.4
22
C
29
NH4CHO2
55.8
45.1
CH2O2
40.7
45.0
H2O
3.5
9.9
C
39
NH4CHO2
57.8
50.0
CH2O2
42.2
50.0
H2O
0
0
C
Table 2. Solubility in the NH
4
CHO
2
-CH
2
O
2
-H
2
O system at 283.2 K.
Chemical
1
10
0
* Mole Fraction
1
Chemical
2
Mole Fraction
2
Chemical
3
Mole Fraction
3
Solid Phase(s)
c
NH4CHO2
25.6
HCHO2
0
H2O
74.4
A
NH4CHO2
29.4
HCHO2
8.9
H2O
61.7
A
NH4CHO2
38.2
HCHO2
38.2
H2O
23.6
A
NH4CHO2
42.0
HCHO2
58.0
H2O
0
B
NH4CHO2
38.4
HCHO2
38.4
H2O
23.2
C
NH4CHO2
34.0
HCHO2
66.0
H2O
0
D
Notes:
Table 1
a
These values were calculated by the compiler.
Table 1
b
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).
Table 2
a
The solid phases are: A = NH
4
CHO
2
(stable); B = NH
4
CHO
2
(unstable); C = NH
4
CHO
2
•HCHO
2
(unstable); D = NH
4
CHO
2
•HCHO
2
(stable).
Method/Apparatus/Procedure:
The freezing point method was used to study the system.
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.