Home
Introduction
Search Menu
IUPAC Series (PDF)
Reference
Version History
About the Project
Disclaimer
Contact Us
Acknowledgements
IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Diammonium hydrogenphosphate with Ammonium chlorate, Magnesium hydrogenphosphate, Magnesium chlorate and Water
Components:
(1) Ammonium chlorate; NH4ClO3; [10192-29-7]
NIST Chemistry WebBook
for detail
(2) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(3) Magnesium chlorate; Mg(ClO3)2; [10326-21-3]
NIST Chemistry WebBook
for detail
(4) Magnesium hydrogenphosphate; MgHPO4; [7757-86-0]
NIST Chemistry WebBook
for detail
(5) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Tukhtaev, S.; Kucharov, Kh.; Askarova, M.K., Uzb. Khim. Zh. 1977, 32.
Variables:
Concentration = Temperature and composition.
Prepared By:
L. V. Chernykh and J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solutions co-existing with three solid phases in the (NH
4
)
2
HPO
2
-Mg(ClO
3
)
2
-H
2
O system
t/°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)
(b)
-52.1
Mg(ClO3)2
36.3
2.99
(NH4)2HPO4
0.20
0.024
H2O
63.5
A + B + C
-21.8
Mg(ClO3)2
40.4
3.56
(NH4)2HPO4
0.20
0.025
H2O
59.4
B + C + D
-7.6
Mg(ClO3)2
43.8
4.09
(NH4)2HPO4
0.25
0.034
H2O
55.95
C + D + E
-5.7
Mg(ClO3)2
0.3
0.02
(NH4)2HPO4
25.1
2.55
H2O
74.6
A + C + F
-14.9
Mg(ClO3)2
0.4
0.03
(NH4)2HPO4
38.8
4.83
H2O
60.8
C + F + G
Notes:
Table 1
a
The molalities were calculated by the compilers.
Table 1
b
The solid phases are: A=ice; B=Mg(ClO
3
)
2
·16H
2
O; C=Mg
3
(PO
4
)
2
·18H
2
O; D=Mg(ClO
3
)
2
·12H
2
O; E=Mg(ClO
3
)
2
·6H
2
O; F=(NH
4
)
2
HPO
2
·2H
2
O; G=(NH
4
)
2
HPO
2
.
Method/Apparatus/Procedure:
A visual polythermic method and the isothermal method were used but details are not given.
Source and Purity of Materials:
Chemically pure (NH
4
)
2
HPO
4
was recrystallized twice. Mg(ClO
3
)
2
was recrystallized from ether. After the final recrystallization its purity was 99.1%.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.