SDS Volume (4739)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Pochtakova, E. I.; Zh. Obshch. Khim. 44, 241-8 (1974).
Variables:
Prepared by:
Method/Apparatus/Procedure:
A visual polythermal method was used.
Source and Purity of Materials:
- The materials were prepared by reacting CP carbonates with a slight excess of formic acid [1].
Component (1) undergoes a phase transition at 140°C [2].
Component (2) undergoes a phase transition at 242°C [1].
Estimated Errors:
Ambient temperature: The compiler estimates the accuracy of the temperature measurements to be probably ±2 K.
Mass concentration (m/v) (1): No information is given.
References
1
Sokolov, N. M.; Zh. Obshch. Khim. 24, 1581-93 (1954).
2
Sokolov, N. M.; Tezisy Dokl. X Nauch. Konf. S. M. I. (1956).
Components:
- Magnesium formate, $\ce{ Mg(CHO2)2 }$; [557-39-1] NIST WebBook
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
Experimental Data
Note: The system was investigated at 0 ≤ 100 x1 ≤ 30 due to thermal instability of component 1. A eutectic is present at 252°C and 100 x1 = 21.
Melting temperatures for different mole fractions
| $T_{\rm{m}}$ ($\pu{K}$) | $T_{\rm{m}}$ (°C) | $100 x_{1}$ |
|---|---|---|
| 531 | 258 | 0 |
| 530 | 257 | 2.5 |
| 529 | 256 | 5 |
| 528 | 255 | 7.5 |
| 524 | 251 | 1E+1 |
| 526 | 253 | 15 |
| 526 | 253 | 17.5 |
| 525 | 252 | 2E+1 |
| 530 | 257 | 22.5 |
| 540 | 267 | 25 |
| 555 | 282 | 27.5 |
| 573 | 300 | 3E+1 |
(a) The T/K values were calculated the compiler.
