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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Diammonium hydrogenphosphate, Ammonium nitrate, Potassium chloride and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(2) Ammonium nitrate; NH4NO3; [6484-52-2]
NIST Chemistry WebBook
for detail
(3) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(4) Potassium chloride; KCl; [7747-40-7]
NIST Chemistry WebBook
for detail
(5) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Slack, A.V.; Hatfield, J.D.; Shaffer, H.B.; Driskell, J.C., J. Agr. Food Chem. 1959, 7, 404.
Variables:
Concentration = Composition at –1.5 ºC.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility (expressed as % N + % P
2
O
5
+ % K
2
O) in the NH
4
H
2
PO
4
-(NH
4
)2HPO
4
-NH
4
NO
3
-KCl-H
2
O system at 271.5 K
Chemical
1
Mole Fraction
1
Mol ratio NH<3>/H<3>PO<4> = 1.5
Mole Fraction
2
Mol ratio NH<3>/H<3>PO<4> = 1.6
Mole Fraction
3
Mol ratio NH<3>/H<3>PO<4> = 1.7
Nutrient Ratio 1-3-0
31.9 (c)
35.9 (d)
33.9 (d)
1-2-0
27.6 (c)
30.5 (d)
29.3 (d)
1-1-0
24.1 (c)
27.2 (d)
23.5 (d)
2-1-0
21.5 (c)
24.9 (d)
22.9 (d)
1-3-1
30.5 (c)
34.3 (d)
31.9 (d)
1-2-1 (b)
23.1
23.7
24.5
1-1-1 (b)
16.1
15.7
16.1
2-1-2 (b)
12.7
12.7
12.7
1-3-3 (e)
24.9
24.3
24.3
1-2-3 (e)
22.1
23.3
22.9
1-1-3 (b)
15.1
15.3
15.5
2-1-6 (b)
12.5
13.1
12.9
Notes:
Table 1
a
The nutirient ratio is the weight ratio N : P
2
O
5
: K
2
O.
Table 1
b
KNO
3
is the solid phase in equilibrium with the solution above.
Table 1
c
NH
4
H
2
PO
4
is the solid phase in equilibrium with the solution above.
Table 1
d
(NH
4
)
2
HPO
4
is the solid phase in equilibrium with the solution above.
Table 1
e
KCl is the solid phase in equilibrium with the solution above.
Method/Apparatus/Procedure:
A series of solutions of each ratio, differing by small increments of water content, were cooled to –1.5 °C, and each solution (about 50 ml) was seeded with about 50 mg of crystals. The mixtures were agitated mildly for about 3 days. The disappearance or growth of crystals in the samples during this period permitted determination of the solubility.
Source and Purity of Materials:
All the salts used were reagent grade. The water was deionized.
Estimated Errors:
Solubility: The solubility was determined within 0.1 % to 0.2 % of the plant nutrient.
Temperature: The temperature was kept constant to within –1.5 ± 0.7 °C.