Home
Introduction
Search Menu
IUPAC Series (PDF)
Reference
Version History
About the Project
Disclaimer
Contact Us
Acknowledgements
IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Potassium formate with Potassium hydroxide and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
NIST Chemistry WebBook
for detail
(2) Potassium hydroxide; KOH; [1310-58-3]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Bianco, P.; Haladjian, J.; Sabbah, R., Bull. Soc. Chim. Fr. 7, 2301 (1969).
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 KCHO
2
-KOH-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
K2O
Liquid
1.32
KOH
1.57
1.28
KCHO2
76.64
41.82
A
K2O
Liquid
3.88
KOH
4.62
3.44
KCHO2
71.41
35.42
A
K2O
Liquid
13.42
KOH
15.98
9.12
KCHO2
52.79
20.10
A
K2O
Liquid
18.78
KOH
22.36
12.16
KCHO2
44.88
16.29
A
K2O
Liquid
29.29
KOH
34.88
17.23
KCHO2
29.04
9.57
A
K2O
Liquid
34.87
KOH
41.53
20.70
KCHO2
22.72
7.56
A
K2O
Liquid
38.67
KOH
46.05
21.01
KCHO2
14.89
4.53
A
K2O
Liquid
40.45
KOH
48.17
21.48
KCHO2
11.86
3.53
A+B
K2O
Liquid
42.67
KOH
50.81
21.09
KCHO2
6.25
1.73
B
K2O
Liquid
44.89
KOH
53.46
20.47
KCHO2
0.0
0.0
K2O
Liquid
45.24
KOH
53.85
20.80
KCHO2
0.0
0.0
Notes:
a
These values were calculated by the compilers.
b
The solid phases are: A = KCHO
2
; B = KOH•2H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. The concentration of potassium formate was determined by potentiometric titration. The solid phases were identified thermogravimetrically and by the Schreinemakers' method.
Source and Purity of Materials:
Merck p.a. grade formic acid was used. The KOH was Riedel de Haen p.a. grade. The water was de-ionized.
Estimated Errors:
Temperature: Accuracy of temperature measurement was ± 0.05°C. Solubility error was ± 1%.