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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lanthanum formate with Urea and Water
Components:
(1) Lanthanum formate; La(CHO2)3; [2081-11-0]
NIST Chemistry WebBook
for detail
(2) Urea; CH4N2O; [57-13-6]
NIST Chemistry WebBook
for detail
(3) 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 at 25 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the La(CHO
2
)
3
-CH
4
N
2
O-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
a
Solid Phase(s)
b
La(CHO2)3
Liquid
0.31
0.011
CH4N2O
---
---
A
La(CHO2)3
Liquid
0.35
0.013
CH4N2O
3.61
6.26
A
La(CHO2)3
Liquid
0.41
0.017
CH4N2O
9.65
1.79
A
La(CHO2)3
Liquid
0.40
0.016
CH4N2O
10.23
1.91
A
La(CHO2)3
Liquid
0.47
0.020
CH4N2O
15.11
2.98
A
La(CHO2)3
Liquid
0.41
0.018
CH4N2O
15.40
3.046
A
La(CHO2)3
Liquid
0.54
0.024
CH4N2O
16.99
3.430
A
La(CHO2)3
Liquid
0.48
0.022
CH4N2O
19.97
4.180
A
La(CHO2)3
Liquid
0.55
0.027
CH4N2O
24.71
5.505
A
La(CHO2)3
Liquid
0.66
0.035
CH4N2O
31.25
7.642
A
La(CHO2)3
Liquid
0.63
0.035
CH4N2O
33.63
8.517
A
La(CHO2)3
Liquid
0.71
0.038
CH4N2O
31.64
7.787
A
La(CHO2)3
Liquid
0.75
0.042
CH4N2O
34.29
8.789
A
La(CHO2)3
Liquid
0.91
0.053
CH4N2O
36.98
9.915
A
La(CHO2)3
Liquid
0.74
0.048
CH4N2O
43.20
12.83
A
La(CHO2)3
Liquid
0.80
0.053
CH4N2O
43.83
13.18
A
La(CHO2)3
Liquid
0.96
0.065
CH4N2O
44.95
13.84
A
La(CHO2)3
Liquid
0.87
0.060
CH4N2O
46.26
14.57
A
La(CHO2)3
Liquid
0.79
0.054
CH4N2O
45.88
14.32
A
La(CHO2)3
Liquid
0.87
0.062
CH4N2O
47.77
15.49
A+B
La(CHO2)3
Liquid
0.91
0.080
CH4N2O
57.78
23.29
B
La(CHO2)3
Liquid
0.42
0.036
CH4N2O
56.70
22.02
B
La(CHO2)3
Liquid
---
---
CH4N2O
54.50
19.94
B
Notes:
a
The molality values were calculated by the compilers and the editor.
b
The solid phases are: A = La(CHO
2
)
3
; B = CH
4
N
2
O.
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.