IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Potassium formate with Potassium thiocyanate

Components:
   (1) Potassium formate; KCHO2; [590-29-4]  NIST Chemistry WebBook for detail
   (2) Potassium thiocyanate; KCNS; [333-20-0]  NIST Chemistry WebBook for detail

Original Measurements:
   Berchiesi, G.; Lafitte, M., J. Chim. Phys. 877-81 (1971).

Variables:

Prepared By:
   P. Baldini

Experimental Remarks:

   Note 1: There is a eutectic at 78.5 ºC and 100x₂ = 46 (compiler).
Note 2: Data relevant to the liquidus branch richer in component (2) were published earlier.¹

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)


t/°C	T/K	Mole Fraction₂
176.00	449.15	100
169.10	442.25	95.10
161.98	435.13	90.43
154.50	427.65	85.79
146.50	419,65	81.03
138.28	411.43	76.41
130.28	403.43	71.76
123.90	397.05	68.20
117.85	391.00	64.85
108.22	381.37	59.85
97.75	370.90	54.00
88.15	361.30	50.03
81.03	354.18	46.91
79.85	353.00	44.45
84.25	357.40	42.18
87.55	360.70	40.52
89.70	362.85	39.28
93.88	367.03	37.25
96.20	369.35	35.88
105.48	378.63	32.19
114.40	387.55	28.41
124.20	397.35	24.37
133.90	407.05	19.91
143.92	417.07	15.12
152.95	426.10	10.16
161.65	434.80	4.97
168.70	441.85	0

Notes:
   ^a  The T/K values were calculated the compiler.

Method/Apparatus/Procedure:
   The liquidus was determined with a visual method² supplemented with DSC measurements. Enthalpy changes were measured but not reported.

Source and Purity of Materials:
   Not stated. Component (1) undergoes a phase transition at 418 K.¹ Component (2) undergoes a phase transition1 at 415 K.¹

Estimated Errors:
   Solubility: No information is given.
   Temperature: The compiler estimates the accuracy of the temperature measurements to be probably ± 0.05 K.

References:
   ¹M. Braghetti, G. Berchiesi, and P. Franzosini, Ric. Sci. 39, 576 (1969).
   ²M. Braghetti, D. Leonesi, and P. Franzosini, Ric. Sci. 38, 116 (1968).