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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Diammonium sulfate and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
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
H
2
PO
4
-(NH
4
)
2
SO
4
-H
2
O system at 25 °C.
Chemical
1
Composition
1
[g/100g H2O]
10
2
* Mass Fraction w
1
(a)
m
1
[mol/kg]
(a)
Chemical
2
Composition
2
[g/100g H2O]
10
2
* Mass Fraction w
2
(a)
m
2
[mol/kg]
(a)
Chemical
3
10
2
* Mass Fraction w
3
Solid Phase(s)
(b)
NH4H2PO4
41.30
29.23
3.59
(NH4)2SO4
0.00
0.00
0.00
H2O
70.77
A
NH4H2PO4
40.20
28.67
3.61
(NH4)2SO4
2.28
2.23
0.24
H2O
69.10
A
NH4H2PO4
37.80
27.43
3.56
(NH4)2SO4
5.89
5.56
0.63
H2O
67.01
A
NH4H2PO4
33.60
25.15
3.43
(NH4)2SO4
12.60
11.19
1.33
H2O
63.66
A
NH4H2PO4
30.70
23.49
3.43
(NH4)2SO4
20.40
16.94
2.15
H2O
59.57
A
NH4H2PO4
27.50
21.57
3.44
(NH4)2SO4
21.50
23.95
3.33
H2O
54.48
A
NH4H2PO4
25.00
20.00
3.10
(NH4)2SO4
31.50
23.95
3.23
H2O
56.05
A
NH4H2PO4
25.00
20.00
3.39
(NH4)2SO4
40.30
28.72
4.24
H2O
51.28
A + B
NH4H2PO4
22.10
18.10
3.30
(NH4)2SO4
52.10
34.25
5.44
H2O
47.65
B
NH4H2PO4
19.10
16.04
3.40
(NH4)2SO4
75.20
42.92
7.91
H2O
41.04
B
NH4H2PO4
10.30
9.34
1.72
(NH4)2SO4
76.60
43.37
6.94
H2O
47.29
B
NH4H2PO4
5.29
5.02
0.85
(NH4)2SO4
77.20
43.57
6.41
H2O
51.41
B
Notes:
Table 1
a
These values were calculated by the compilers.
Table 1
b
The solid phases are: A=NH
4
H
2
PO
4
; 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
Berlin, L.E.; Mantsev, B.M. Zh. Prikl. Khim. (Leningrad) 1933,
6
, 385.