SDS Volume

Volume 73. Metal and Ammonium Formate Systems, p None

Source Publication

Kendall, J.; Adler, H.; J. Am. Chem. Soc. 43, 1470 (1921).

Conditions:

Room Temp: -31.5 - 167.5 °C

Compiler:

T.A. Ageyeva

Methodology:

The only information given is that the solubility values were determined by the freezing point method.

Sample Information:
  1. The potassium salt was prepared by dissolving the carbonate in 90% formic acid. After heating to drive out the $\ce{CO2}$, the salt was crystallized from solution and heated just below its melting point. It was then recrystallized from absolute ethanol and dried over 99% sulfuric acid in vacuo (MP = 440.7 K). The formic acid was prepared by treating a c.p. product with $\ce{B2O3}$. It was then distilled in vacuo until a product melting above 281.6 K was obtained.
Measurement Errors:

Ambient temperature: Nothing is specified.

System Components:
  1. Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
  2. Formic acid, $\ce{ CH2O2 }$; [64-18-6] NIST WebBook
Experimental Data
$T$ (°C) $100 x_{1}$ Phase (s) ()
8.4 0.0 A
7.4 0.97 A
4.9 3.02 A
2.2 4.73 A
-0.9 6.36 A
-5.7 8.43 A
-12.6 10.74 A
-18.7 12.63 A
-23.8 13.88 A
-31.5 15.57 A
-29.0 16.32 B
-27.3 16.62 B
-23.5 17.44 B
-21.7 18.10 B
-19.5 18.88 B
-19.0 19.48 C
-16.0 19.91 C
-8.0 21.21 C
-0.6 22.79 C
-10.1 23.04 D
7.3 24.14 D
29.9 25.98 D
53.0 28.56 D
65.1 30.41 D
72.9 31.97 D
80.6 33.74 D
93.0 37.29 D
96.1 38.34 D
103.2 41.68 D
104.3 42.63 D
104.6 42.91 D
107.5 45.95 D
108.6 50.25 D
108.2 51.49 D
107.2 54.24 D
103.2 58.47 D
100.6 61.14 D
98.7 63.14 D
108.1 66.45 E
114.5 68.71 E
122.3 71.24 E
130.7 75.18 E
135.8 77.75 E
143.6 82.41 E
150.0 86.68 E
157.3 91.24 E
167.5 100.0 E

(a) The solid phases are: A = CH2O2; B = KCHO2·3CH2O2; C = KCHO2·2CH2O2; D = KCHO2·CH2O2; E = KCHO2.

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