SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Sokolov, N. M.; Zh. Obshch. Khim. 24, 1581-93 (1954).
Conditions:
Compiler:
Methodology:
A visual polythermal method was used. The melts were contained in glass tubes and stirred. The temperatures were measured with a Nichrome-Constantan thermocouple and a 17 mV full scale millivoltmeter. The temperature readings refer to the disappearance of isotropicity in the melt on cooling.
Sample Information:
- The materials were prepared by reacting aqueous "chemically pure" sodium carbonate with a slight excess of the analytical grade proper acid. The solvent and excess acid were removed by heating to 160°C.
Measurement Errors:
Ambient temperature: The compiler estimates the accuracy of the temperatures to be probably ±2 K.
Mass concentration (m/v) (1): No information is given.
System Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
- Sodium butanoate, $\ce{ NaC4H7O2 }$; [156-54-7] NIST WebBook
Experimental Data
Note: There are two eutectics: one at 252°C and 100 x2 = 2.5; the other at 308°C (erroneously reported as 318°C in the text-compiler) and 100 x2 = 89.
| $T_{\rm{m}}$ ($\pu{K}$) | $T_{\rm{m}}$ (°C) | $100 x_{2}$ |
|---|---|---|
| 531 | 258 | 0 |
| 525 | 252 | 2.5 |
| 560 | 287 | 5 |
| 574 | 301 | 1E+1 |
| 585 | 312 | 15 |
| 591 | 318 | 2E+1 |
| 597 | 324 | 25 |
| 600 | 327 | 3E+1 |
| 606 | 333 | 35 |
| 610 | 337 | 4E+1 |
| 612 | 339 | 45 |
| 614 | 341 | 5E+1 |
| 613 | 340 | 55 |
| 613 | 340 | 6E+1 |
| 612 | 339 | 65 |
| 611 | 338 | 7E+1 |
| 609 | 336 | 75 |
| 604 | 331 | 8E+1 |
| 597 | 324 | 85 |
| 581 | 308 | 89 |
| 584 | 311 | 9E+1 |
| 595 | 322 | 95 |
| 603 | 330 | 1E+2 |
(a) The T/K values were calculated the compiler.
