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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Potassium formate with Strontium formate and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
NIST Chemistry WebBook
for detail
(2) Strontium formate; Sr(CHO2)2; [592-89-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Portnova, S.M.; Ahmatova, Zh. T.; Lepeshkov, I.N., Zh. Neorg. Khim. 31, 2143-5 (1986).
Variables:
Concentration = Composition at 50 ºC
Prepared By:
St. Tepavitcharova 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).)
Solubility values in the KCHO
2
-Sr(CHO
2
)
2
-H
2
O system at 50 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
Solid Phase(s)
a
Sr(CHO2)2
Liquid
16.69
1.13
KCHO2
----
----
A
Sr(CHO2)2
Liquid
10.24
0.69
KCHO2
6.06
0.86
A
Sr(CHO2)2
Liquid
2.65
0.19
KCHO2
20.57
3.18
A
Sr(CHO2)2
Liquid
2.35
0.25
KCHO2
45.50
10.37
A
Sr(CHO2)2
Liquid
2.88
0.39
KCHO2
55.57
15.90
A
Sr(CHO2)2
Liquid
5.65
0.85
KCHO2
56.93
18.09
A+B
Sr(CHO2)2
Liquid
1.15
0.15
KCHO2
56.53
15.88
B
Sr(CHO2)2
Liquid
1.36
0.21
KCHO2
62.44
20.51
B
Sr(CHO2)2
Liquid
0.25
0.04
KCHO2
62.12
19.62
B
Sr(CHO2)2
Liquid
0.95
0.15
KCHO2
64.42
22.11
B
Sr(CHO2)2
Liquid
0.35
0.08
KCHO2
75.26
36.68
B
Sr(CHO2)2
Liquid
0.23
0.06
KCHO2
78.09
42.82
B
Sr(CHO2)2
Liquid
----
----
KCHO2
84.69
65.76
B
Notes:
a
The solid phases are: A = Sr(CHO
2
)
2
•2H
2
O; B = KCHO
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Four weeks were allowed for equilibration. The strontium content of both phases was determined complexometrically in a basic medium, using methylthymolblue as indicator. The potassium content was determined by the tetraphenylborate method.
1
The composition of the solid phases was determined by the Schreinemakers' method.
Source and Purity of Materials:
Suprapure grade Sr(CHO
2
)
2
•2H
2
O was recrystallized. KCHO
2
was prepared by the reaction of KOH with H
2
CO
2
.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.
References:
1
G. G. Rusakova, Zh. Anal. Khim.
18
, 154 (1963).