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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lanthanum formate with Edetic acid disodium salt dihydrate, Glucose, Nitrilotriacetic acid and Water
Components:
(1) Ethylenedinitrilotetraacetic acid disodium salt dihydrate; C10H18N2Na2O10; [6381-92-6]
NIST Chemistry WebBook
for detail
(2) Glucose; C6H12O6; [50-99-7]
NIST Chemistry WebBook
for detail
(3) Lanthanum formate; La(CHO2)3; [2081-11-0]
NIST Chemistry WebBook
for detail
(4) Nitrilotriacetic acid; C6H9NO6; [139-13-9]
NIST Chemistry WebBook
for detail
(5) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Portnova, S.M.; Lyashchenko, A.K., Zh. Neorg. Khim. 27, 2953-8 (1982).
Variables:
Concentration = Composition and temperature
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Part 1. Solubility values in the La(CHO
2
)
3
-EDTA-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
a
Chemical
3
Mass Fraction w
3
m
3
[mol kg-1]
a
Solid Phase(s)
b
H2O
Liquid
99.69
La(CHO2)3
0.31
0.011
EDTA
---
---
A
H2O
Liquid
98.37
La(CHO2)3
0.94
0.035
EDTA
0.69
0.019
A
H2O
Liquid
98.21
La(CHO2)3
0.99
0.37
EDTA
0.80
0.022
A
H2O
Liquid
97.92
La(CHO2)3
1.03
0.038
EDTA
1.05
0.029
A
H2O
Liquid
97.14
La(CHO2)3
1.41
0.053
EDTA
1.45
0.040
A
Part 2. Solubility values in the La(CHO
2
)
3
-glucose-H
2
O system.
t/°C
Chemical
1
Phase
Mass Fraction w
1
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
a
Chemical
3
Mass Fraction w
3
m
3
[mol kg-1]
a
Solid Phase(s)
b
25
H2O
Liquid
95.78
La(CHO2)3
0.22
0.008
Glucose
4.0
0.232
A
25
H2O
Liquid
91.77
La(CHO2)3
0.23
0.009
Glucose
8.0
0.484
A
25
H2O
Liquid
88.62
La(CHO2)3
0.38
0.016
Glucose
11.0
0.689
A
50
H2O
Liquid
95.66
La(CHO2)3
0.34
0.013
Glucose
4.0
0.232
A
50
H2O
Liquid
91.64
La(CHO2)3
0.36
0.014
Glucose
8.0
0.485
A
Part 3. Solubility values in the La(CHO
2
)
3
-nitrilotriacetic acid-H
2
O system.
t/°C
Chemical
1
Phase
Mass Fraction w
1
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
a
Chemical
3
Mass Fraction w
3
m
3
[mol kg-1]
a
Solid Phase(s)
b
25
H2O
Liquid
99.48
La(CHO2)3
0.39
0.014
NTA
0.13
0.007
A
25
H2O
Liquid
99.22
La(CHO2)3
0.28
0.010
NTA
0.50
0.026
A
50
H2O
Liquid
99.5
La(CHO2)3
0.37
0.014
NTA
0.13
0.007
A
Notes:
a
The molality values were calculated by the compilers.
b
The solid phase is: A = La(CHO
2
)
3
.
Method/Apparatus/Procedure:
The isothermal method was used. The lanthanum content of the solid and liquid phases was determined complexometrically using Complexon III and Methylthymol Blue as indicator. The nitrogen content of the liquid phase was determined iodometrically. The nitrogen content of the solid phases was determined by the Dumas method.
Source and Purity of Materials:
Lanthanum formate was obtained by reaction of lanthanum oxide with formic acid.
Estimated Errors:
Solubility: No information is given
Temperature: No information is given.