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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Rubidium formate with Water
Components:
(1) Rubidium formate; RbCHO2; [3495-35-0]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Sidgwick, N.V.; Gentle, J.A.H.R., J. Chem. Soc. 121, 1837 (1922).
Variables:
Temperature = -1.82 ºC to -170 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Remarks:
The molality values were calculated by the compilers.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Composition of equilibrium liquid phase
t/°C
Phase
Mass Fraction w
1
10
0
* Mole Fraction
1
m
1
[mol kg-1]
Solid Phase(s)
c
-1.82
Liquid
6.23
0.909
0.509
A
-5.62
Liquid
15.93
2.549
1.452
A
-7.82
Liquid
20.62
3.463
1.991
A
-10.62
Liquid
25.79
4.573
2.663
A
-13.88
Liquid
30.62
5.744
3.382
A
+3.3
Liquid
78.86
33.97
28.59
B
7.8
Liquid
80.71
36.59
32.06
B
9.5
Liquid
81.37
37.59
33.47
B
14.0
Liquid
83.59
41.09
39.04
B
16.3
Liquid
84.61
43.12
42.13
B
16.5
Liquid
---
---
---
B + C
28.3
Liquid
85.6
45.1
45.6
C
43.6
Liquid
87.77
49.75
55.00
C
49.9
Liquid
89.23
53.34
63.49
C
46.9(a)
Liquid
89.23
53.34
63.49
D
51.0
Liquid
---
---
---
C + D
60.8
Liquid
90.06
55.55
69.43
D
101.7
Liquid
93.89
67.95
117.8
D
170.0(b)
Liquid
100
100
---
D
Notes:
a
Metastable point.
b
Melting point.
c
The solid phases are: A = ice; B = RbCHO
2
•H
2
O; C = RbCHO
2
•0.5H
2
O; D = RbCHO
2
.
Method/Apparatus/Procedure:
The freezing points were measured in a Beckmann apparatus. Analysis was done gravimetrically by evaporating the solution to dryness. At higher temperatures mixtures were sealed in tubes and the temperature at which the last crystal disappeared on warming was observed.
Source and Purity of Materials:
The rubidium formate was prepared by neutralizing the carbonate with formic acid. Commercial 80% formic acid was distilled in a vacuum at 70 °C with enough sulfuric acid to remove the water.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.