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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Diammonium hydrogenphosphate with Thiourea and Water
Components:
(1) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(2) Thiourea; CH4N2S; [62-56-6]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Zakirov, B.S.; Tukhtaev, S.; Beglov, B.M.; Khaymov, B.M., Dokl. Akad. Nauk Uzb. SSR, 31 (1977).
Variables:
Concentration = Composition at 25 ºC.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the (NH
4
)
2
HPO
4
-CS(NH
2
)
2
-H
2
O system at 25 °C
Chemical
1
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(a)
Chemical
2
10
2
* Mass Fraction w
2
m
2
[mol/kg]
(a)
Chemical
3
10
2
* Mass Fraction w
3
Solid Phase(s)
CS(NH2)2
14.23
2.180
(NH4)2HPO4
----
----
H2O
85.77
CS(NH2)2
CS(NH2)2
13.19
2.156
(NH4)2HPO4
6.44
0.607
H2O
80.37
CS(NH2)2
CS(NH2)2
11.76
2.017
(NH4)2HPO4
11.64
1.151
H2O
76.60
CS(NH2)2
CS(NH2)2
9.58
1.80
(NH4)2HPO4
20.71
2.249
H2O
69.71
CS(NH2)2
CS(NH2)2
8.16
1.62
(NH4)2HPO4
25.49
2.909
H2O
66.35
CS(NH2)2
CS(NH2)2
6.74
1.39
(NH4)2HPO4
29.65
3.529
H2O
63.61
CS(NH2)2
CS(NH2)2
5.19
1.15
(NH4)2HPO4
35.46
4.524
H2O
59.35
CS(NH2)2
CS(NH2)2
4.24
0.978
(NH4)2HPO4
38.81
5.160
H2O
56.95
CS(NH2)2 + (NH4)2HPO4
CS(NH2)2
1.98
0.449
(NH4)2HPO4
40.07
5.236
H2O
57.95
(NH4)2HPO4
CS(NH2)2
----
----
(NH4)2HPO4
41.4
5.35
H2O
58.6
(NH4)2HPO4
Notes:
Table 1
a
The molalities were calculated by the compiler.
Method/Apparatus/Procedure:
The isothermal method was used with mechanical stirring. Equilibrium was determined by repeated analysis of the liquid phase. Equilibrium was attained in 24 hrs. The composition of the solid phases was determined by the Schreinemakers' method.
Source and Purity of Materials:
Nothing is stated. The compiler assumes the materials are the same as those used in Ref. 1.
Estimated Errors:
Solubility: No information given.
Temperature: The only information given is that the temperature was controlled to within ± 0.2 K.
References:
1
B. S. Zakirov, B. M. Khaymov, S. Tukhtaev, and B. M. Beglov, Dokl. Akad. Nauk. Uzb. SSR, 48 (1978).