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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Diammonium hydrogenphosphate with Diammonium sulfate and Water
Components:
(1) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(2) Diammonium sulfate; (NH4)2SO4; [7783-20-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Vol'fkovich, S.I.; Berlin, L.E.; Mantsev, B.M., Tr. NIUIFa, 228 (1940).
Variables:
Concentration = Composition at 25 ºC.
Prepared By:
L. V. Chernykh and J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the (NH
4
)
2
HPO
2
-(NH
4
)
2
SO
4
-H
2
O system at 25 °C
Chemical
1
Composition
1
(a)
10
2
* Mass Fraction w
1
(b)
m
1
[mol/kg]
(b)
Chemical
2
Composition
2
(a)
10
2
* Mass Fraction w
2
(b)
m
2
[mol/kg]
(b)
Chemical
3
10
2
* Mass Fraction w
3
(b)
Solid Phase(s)
(c)
(NH4)2HPO4
74.5
42.7
5.64
(NH4)2SO4
0.0
0.0
0.0
H2O
57.3
A
(NH4)2HPO4
55.0
35.5
6.01
(NH4)2SO4
24.7
19.8
3.35
H2O
44.7
A
(NH4)2HPO4
42.7
29.9
6.12
(NH4)2SO4
49.5
33.1
6.77
H2O
37.0
A
(NH4)2HPO4
36.6
26.8
6.19
(NH4)2SO4
67.7
40.4
9.32
H2O
32.8
A + B
(NH4)2HPO4
0.0
0.0
0.0
(NH4)2SO4
76.4
43.3
5.78
H2O
56.7
B
Notes:
Table 1
a
The composition units are: g/100g H
2
O.
Table 1
b
These values were calculated by the compilers.
Table 1
c
The solid phases are: A=(NH
4
)
2
HPO
2
; B=(NH
4
)
2
SO
4
.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibration required 4 to 5 days. The composition of the solid phases was determined by the Schreinemakers method. More experimental details have been described previously.
1
Source and Purity of Materials:
No information is given.
Estimated Errors:
Solubility: No information given.
Temperature: The temperature was kept constant within ± 0.05 K. No other information is given.
References:
1
L. E. Berlin and B. M. Mantsev, Zh. Prikl. Khim. (Leningrad)
6
, 385 (1933).