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:
Methodology:
The only information given is that the solubility values were determined by the freezing point method.
Sample Information:
- 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:
- Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
- 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.


