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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Ammonium chloride and Water
Components:
(1) Ammonium chloride; NH4Cl; [12125-02-9]
NIST Chemistry WebBook
for detail
(2) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Askenasy, P.; Nessler, F., F.Z. Anorg. Chem. 189, 305 (1930).
Variables:
Concentration = Composition at 0 ºC
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
The 0 °C isotherm for the NH
4
H
2
PO
4
-NH
4
Cl-H
2
O system.
Chemical
1
Composition
1
(a)
10
2
* Mass Fraction w
1
(b)
m
1
[mol/kg]
(c)
Chemical
2
Composition
2
(a)
10
2
* Mass Fraction w
2
(b)
m
2
[mol/kg]
(c)
Chemical
3
Composition
3
(a)
10
2
* Mass Fraction w
3
(b)
Solid Phase(s)
(d)
ρ [g/cm3]
NH4Cl
100.0
22.91
5.556
NH4H2PO4
---
---
----
H2O
1000
77.09
A
1.0655
NH4Cl
98.3
22.6
5.52
NH4H2PO4
1.7
0.84
0.095
H2O
990
76.6
A
1.0831
NH4Cl
92.2
21.4
5.36
NH4H2PO4
7.9
3.9
0.46
H2O
995
74.6
A + B
1.0846
NH4Cl
78.6
12.6
2.93
NH4H2PO4
21.4
7.35
0.798
H2O
1490
80.05
B
1.0872
NH4Cl
62.9
7.53
1.70
NH4H2PO4
37.1
9.54
1.00
H2O
2060
82.93
B
1.0887
NH4Cl
44.6
4.81
1.09
NH4H2PO4
55.4
12.8
1.36
H2O
2270
82.35
B
1.0955
NH4Cl
20.2
1.99
0.458
NH4H2PO4
79.8
16.9
1.81
H2O
2450
81.13
B
1.0990
NH4Cl
---
----
-----
NH4H2PO4
100.0
18.50
1.974
H2O
2815
81.50
B
1.1043
Notes:
Table 1
a
The composition unit is mol/100 mol of solute.
Table 1
b
These values were calculated by the compiler.
Table 1
c
The molalities were calculated by the compiler and are expressed as mol kg
–1
.
Table 1
d
The solid phases are: A=NH
4
Cl; B=NH
4
H
2
PO
4
.
Method/Apparatus/Procedure:
The isothermal method was used. The mixtures were agitated in a thermostat for 2 to 4 days. The solid phase was separated from the liquid phase by centrifuging. The analytical procedures are not described.
Source and Purity of Materials:
No information is given.
Estimated Errors:
Solubility: No information given.
Temperature: The temperature was controlled to within ± 0.1 K. No other information is given.